Fixes a incompatibility-related crash when the hiding media previews option is selected and the device is API level 19 or under.

app/src/main/java/com/keylesspalace/tusky/adapter/StatusViewHolder.java

@@ -23,6 +23,7 @@ import android.support.annotation.DrawableRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.content.ContextCompat;
+import android.support.v7.content.res.AppCompatResources;
 import android.support.v7.widget.RecyclerView;
 import android.text.Spanned;
 import android.view.View;
@@ -344,7 +345,7 @@ public class StatusViewHolder extends RecyclerView.ViewHolder {
 
         // Set the icon next to the label.
         int drawableId = getLabelIcon(attachments[0].type);
-        Drawable drawable = ContextCompat.getDrawable(context, drawableId);
+        Drawable drawable = AppCompatResources.getDrawable(context, drawableId);
         ThemeUtils.setDrawableTint(context, drawable, android.R.attr.textColorTertiary);
         mediaLabel.setCompoundDrawablesWithIntrinsicBounds(drawable, null, null, null);