Enable largeHeap option (#5258)

This should help with some OOM issues we're seeing when both playing and transcoding video files in the attachment preview screen

Author: jmartinesp

app/src/main/AndroidManifest.xml

@@ -19,6 +19,7 @@
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:largeHeap="true"
         android:localeConfig="@xml/locales_config"
         android:networkSecurityConfig="@xml/network_security_config"
         android:roundIcon="@mipmap/ic_launcher_round"