Combined error message in ReportAbuse

Fixes #1724 

Clubbed "package has a bug" and "package failed to install" to one single reason. When this option is chosen an error message will be popped out and all other fields will be disabled.

Manually tested the below:

Report abuse after logging in and chose "Package has a bug/Failed to install".
Report abuse without logging in and chose "Package has a bug/Failed to install".
Switch back and forth between reasons and make sure the fields get disabled and enabled appropriately.