Red border is not removed after typing valid IP address

Found issue:

When user types incorrect IP address in Android Connector view and tries to connect, Device IP field is rounded with red color as expected. Typing correct IP and successfully connecting to device won't remove this red color border though, which is not expected.

Steps to reproduce:

• Open Qt UI Viewer
• Open Design Studio and some project
• Go to File -> Deploy Project to Android
• Type some invalid IP address to Device IP field
• Click Connect
• -> Field is rounded with red color and (when invalid IP is removed) hint in the field says "Please enter a valid IP address" -> expected
• Enter a valid IP address and click Connect
• -> Connection succeeds, but red color rounding the field is not removed as would be expected
• -> Hint also sticks to "Please enter a valid IP address" instead of the normal "Enter IP address"