fix: hide button after show images

app/src/main/java/org/dystopia/email/AdapterMessage.java

@@ -552,7 +552,8 @@ public class AdapterMessage extends PagedListAdapter<TupleMessageEx, AdapterMess
         }
 
         private void onShowImages(EntityMessage message) {
-            properties.setImages(message.id, !properties.showImages(message.id));
+            properties.setImages(message.id, true);
+            btnImages.setEnabled(false);
 
             Bundle args = new Bundle();
             args.putSerializable("message", message);

app/src/main/java/org/dystopia/email/FragmentEx.java

@@ -17,6 +17,7 @@ package org.dystopia.email;
     along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
 
     Copyright 2018 by Marcel Bokhorst (M66B)
+    Copyright 2019 by Distopico <distopico@riseup.net>
 */
 
 import android.content.res.Configuration;

app/src/main/java/org/dystopia/email/FragmentOptions.java

@@ -17,6 +17,7 @@ package org.dystopia.email;
     along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
 
     Copyright 2018 by Marcel Bokhorst (M66B)
+    Copyright 2019 by Distopico <distopico@riseup.net>
 */
 
 import android.content.SharedPreferences;