Remove unused import in SingleUploadFragment

Author: Suchit Kar

app/src/main/java/fr/free/nrw/commons/upload/SingleUploadFragment.java

@@ -5,7 +5,6 @@
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.graphics.Color;
-import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.preference.PreferenceManager;