add block button on incoming contact request

Accepting and discarding was already possible but not blocking
requests from somebody (banning it). This is now possible when
looking at an incoming contact request by clicking on a red button.

Change-Id: I89914beaf27713cabece02de107569b1e1f851d0
Reviewed-by: Olivier Soldano <olivier.soldano@savoirfairelinux.com>
diff --git a/contactrequestwidget.cpp b/contactrequestwidget.cpp
index b8cb31c..930645d 100644
--- a/contactrequestwidget.cpp
+++ b/contactrequestwidget.cpp
@@ -60,3 +60,12 @@
     setCurrentContactRequest(nullptr);
     emit choiceMade();
 }
+
+void ContactRequestWidget::on_blockCRButton_clicked()
+{
+    if (cr_ != nullptr) {
+        cr_->block();
+    }
+    setCurrentContactRequest(nullptr);
+    emit choiceMade();
+}