use URL_SCHEME from package.json; simplify PopOpCode.tsx

Instead of hardcoding `emission://`, we can grab it from the package json. This way, the 'emission' string will only need to be changed in one place for other versions of the app.
And since QrCode.tsx is able to handle either URLs or plain tokens, we can also simplify PopOpCode to just accept the plain token and pass this through to QrCode.tsx

www/js/components/QrCode.tsx

@@ -5,6 +5,9 @@ we can remove this wrapper and just use the QRCode component directly */
 import React from 'react';
 import QRCode from 'react-qr-code';
 import { logDebug, logWarn } from '../plugin/logger';
+import packageJsonBuild from '../../../package.cordovabuild.json';
+
+const URL_SCHEME = packageJsonBuild.cordova.plugins['cordova-plugin-customurlscheme'].URL_SCHEME;
 
 export function shareQR(message) {
   /*code adapted from demo of react-qr-code*/
@@ -45,7 +48,7 @@ export function shareQR(message) {
 const QrCode = ({ value, ...rest }) => {
   let hasLink = value.toString().includes('//');
   if (!hasLink) {
-    value = 'emission://login_token?token=' + value;
+    value = `${URL_SCHEME}://login_token?token=${value}`;
   }
 
   return (

www/js/control/PopOpCode.tsx

@@ -6,13 +6,10 @@ import QrCode from '../components/QrCode';
 import { AlertManager } from '../components/AlertBar';
 import { settingStyles } from './ProfileSettings';
 
-const PopOpCode = ({ visibilityValue, tokenURL, action, setVis }) => {
+const PopOpCode = ({ visibilityValue, token, action, setVis }) => {
   const { t } = useTranslation();
   const { colors } = useTheme();
 
-  const opcodeList = tokenURL.split('=');
-  const opcode = opcodeList[opcodeList.length - 1];
-
   function copyText(textToCopy) {
     navigator.clipboard.writeText(textToCopy).then(() => {
       AlertManager.addMessage({ msgKey: 'Copied to clipboard!' });
@@ -22,13 +19,7 @@ const PopOpCode = ({ visibilityValue, tokenURL, action, setVis }) => {
   let copyButton;
   if (window['cordova'].platformId == 'ios') {
     copyButton = (
-      <IconButton
-        icon="content-copy"
-        onPress={() => {
-          copyText(opcode);
-        }}
-        style={styles.button}
-      />
+      <IconButton icon="content-copy" onPress={() => copyText(token)} style={styles.button} />
     );
   }
 
@@ -41,8 +32,8 @@ const PopOpCode = ({ visibilityValue, tokenURL, action, setVis }) => {
         <Dialog.Title>{t('general-settings.qrcode')}</Dialog.Title>
         <Dialog.Content style={styles.content}>
           <Text style={styles.text}>{t('general-settings.qrcode-share-title')}</Text>
-          <QrCode value={tokenURL} style={{ marginHorizontal: 8 }}></QrCode>
-          <Text style={styles.opcode}>{opcode}</Text>
+          <QrCode value={token} style={{ marginHorizontal: 8 }}></QrCode>
+          <Text style={styles.opcode}>{token}</Text>
         </Dialog.Content>
         <Dialog.Actions>
           <IconButton icon="share" onPress={() => action()} style={styles.button} />

www/js/control/ProfileSettings.tsx

@@ -579,7 +579,7 @@ const ProfileSettings = () => {
       <PopOpCode
         visibilityValue={opCodeVis}
         setVis={setOpCodeVis}
-        tokenURL={'emission://login_token?token=' + authSettings.opcode}
+        token={authSettings.opcode}
         action={() => shareQR(authSettings.opcode)}></PopOpCode>
 
       {/* {view privacy} */}