AndroidManifest: set camera2 feature to not required

Brought by document scanner lib, but not actually required. If set to required,
devices without this feature will not see the app in Play Store.

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

app/src/main/AndroidManifest.xml

@@ -26,6 +26,12 @@
     <uses-permission android:name="android.permission.READ_CALENDAR" />
     <uses-permission android:name="android.permission.WRITE_CALENDAR" />
 
+    <!-- Used for document scanning, but lib declares it as required, which it's not -->
+    <uses-feature
+        android:name="android.hardware.camera2"
+        android:required="false"
+        tools:node="replace" />
+
     <!-- WRITE_EXTERNAL_STORAGE may be enabled or disabled by the user after installation in
         API >= 23; the app needs to handle this -->
     <uses-permission