fix: hide copy to clipboard while QR is not ready

src/main/java/org/thoughtcrime/securesms/qr/BackupProviderFragment.java

@@ -86,6 +86,7 @@ public class BackupProviderFragment extends Fragment implements DcEventCenter.Dc
                 try {
                     SVG svg = SVG.getFromString(QrShowFragment.fixSVG(dcBackupProvider.getQrSvg()));
                     qrImageView.setSVG(svg);
+                    qrImageView.setVisibility(View.VISIBLE);
                 } catch (SVGParseException e) {
                     e.printStackTrace();
                 }

src/main/res/layout/backup_provider_fragment.xml

@@ -106,6 +106,7 @@
 		android:layout_height="0dp"
 		android:layout_weight="1"
 		android:layout_marginBottom="16dp"
+        android:visibility="gone"
 		android:contentDescription="@string/qrscan_title" />
 
 	<TextView