fix: Make sidebar buttons pixel perfect

Co-authored-by: Ferdinand Thiessen <opensource@fthiessen.de>
Signed-off-by: Carl Schwan <carl@carlschwan.eu>

src/components/NcAppSidebar/NcAppSidebar.vue

@@ -1136,7 +1136,7 @@ export default {
 </style>
 
 <style lang="scss" scoped>
-$desc-vertical-padding: 18px;
+$desc-vertical-padding: $app-navigation-padding; // align with app navigation
 $desc-vertical-padding-compact: 10px;
 $desc-input-padding: 7px;
 
@@ -1145,7 +1145,7 @@ $desc-name-height: 30px;
 $desc-subname-height: 22px;
 $desc-height: $desc-name-height + $desc-subname-height;
 
-$top-buttons-spacing: 6px;
+$top-buttons-spacing: $app-navigation-padding; // align with app navigation
 
 /*
 	Sidebar: to be used within #content