Add ignore ScopredStorage for WRITE_EXTERNAL_STORAGE permission

Because the permission is needed up to SDK level 29 Lint should be
ignore that one.

Signed-off-by: Tim Krüger <t@timkrueger.me>

app/src/main/AndroidManifest.xml

@@ -64,7 +64,8 @@
         android:maxSdkVersion="22" />
     <uses-permission
         android:name="android.permission.WRITE_EXTERNAL_STORAGE"
-        android:maxSdkVersion="29" />
+        android:maxSdkVersion="29"
+        tools:ignore="ScopedStorage" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />