Resolves #321 - enforce round app icon

app/src/gplay/AndroidManifest.xml

@@ -9,7 +9,6 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/nc_app_name"
         android:networkSecurityConfig="@xml/network_security_config"
-        android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme"
         tools:replace="label, icon, roundIcon, theme, name, allowBackup">

app/src/main/AndroidManifest.xml

@@ -41,7 +41,6 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/nc_app_name"
         android:networkSecurityConfig="@xml/network_security_config"
-        android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme"
         tools:replace="label, icon, roundIcon, theme, name, allowBackup">

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background"/>
-    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
-</adaptive-icon>