Fix JoinRoom cancel button not going to last page

src/gui/Pages/AddChat/CreateRoom.qml

@@ -45,6 +45,7 @@ HFlickableColumnPage {
         publicCheckBox.reset()
         encryptCheckBox.reset()
         blockOtherServersCheckBox.reset()
+        errorMessage.text = ""
 
         pageLoader.showPrevious()
     }

src/gui/Pages/AddChat/DirectChat.qml

@@ -75,8 +75,9 @@ HFlickableColumnPage {
 
         CancelButton {
             onClicked: {
-                userField.item.text = ""
+                userField.item.reset()
                 errorMessage.text   = ""
+
                 pageLoader.showPrevious()
             }
         }

src/gui/Pages/AddChat/JoinRoom.qml

@@ -49,7 +49,7 @@ HFlickableColumnPage {
 
     function cancel() {
         roomField.item.reset()
-        errorMessage.reset()
+        errorMessage.text = ""
 
         pageLoader.showPrevious()
     }