remove requiresapi

Signed-off-by: Mario Danic <mario@lovelyhq.com>

src/main/java/com/owncloud/android/utils/FilesSyncHelper.java

@@ -239,7 +239,6 @@ public class FilesSyncHelper {
         }).start();
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.N)
     public static void scheduleFilesSyncIfNeeded(Context context) {
         // always run this because it also allows us to perform retries of manual uploads
         new JobRequest.Builder(FilesSyncJob.TAG)