fix(color): New inputs disappear until restart

Cherrypick of EdgeTX#4317 and EdgeTX#4330

Co-authored-by: philmoz <philmoz@users.noreply.github.com>

radio/src/gui/colorlcd/model_inputs.cpp

@@ -336,19 +336,22 @@ void ModelInputsPage::newInput()
   menu->setTitle(STR_MENU_INPUTS);
 
   uint8_t chn = 0;
+  uint8_t index = 0;
   ExpoData* line = g_model.expoData;
 
   // search for unused channels
-  for (uint8_t i = 0; i < MAX_EXPOS; i++) {
+  for (uint8_t i = 0; i < MAX_EXPOS && chn < MAX_INPUTS; i++) {
     if (!EXPO_VALID(line) || (line->chn > chn)) {
-      if (chn >= MAX_INPUTS) break;
-      std::string name(getSourceString(chn+1));
-      menu->addLineBuffered(name.c_str(), [=]() { insertInput(chn, i); });
+      uint8_t chnEnd = EXPO_VALID(line) ? line->chn : chn + 1;
+      for (; chn < chnEnd; chn += 1) {
+        std::string name(getSourceString(chn+1));
+        menu->addLineBuffered(name.c_str(), [=]() { insertInput(chn, index); });
+      }
     }
-    if (EXPO_VALID(line))
+    if (EXPO_VALID(line)) {
       chn = line->chn + 1;
-    else
-      chn += 1;
+      index += 1;
+    }
     ++line;
   }