conversationerrorsrow: only show in debug mode

The labels are pretty unclear for most of the users. We can show the
bar only if debug mode is enabled (-d) so that only developpers or
people who need to debug jami can see it while we choose better
error labels.

Change-Id: I2a37d00251f75db878eff44c665a2b17f95a9888

src/app/mainview/components/ConversationErrorsRow.qml

@@ -40,7 +40,7 @@ Rectangle {
                 errorLabel.text = CurrentConversation.errors[0]
                 backendErrorToolTip.text = JamiStrings.backendError.arg(CurrentConversation.backendErrors[0])
             }
-            errorRect.visible = CurrentConversation.errors.length > 0 // If too much noise: && LRCInstance.debugMode()
+            errorRect.visible = CurrentConversation.errors.length > 0 && LRCInstance.debugMode()
         }
     }