Remove livereload changes from `config.xml`

[janpio]

Using ionic cordova run android -l (and similar livereload commands) adds stuff like this to config.xml:

    <content original-src="index.html" src="http://192.168.10.1:8100" />
    ...
    <allow-navigation href="http://192.168.178.34:8100" />
    <allow-navigation href="http://192.168.10.1:8100" />

If somehow possible this should also be removed again after the livereload session is killed to make sure this is not accidentally checked in or built.

[imhoffd]

Finally got around to this. The original-src attribute is reset to src upon all ionic cordova command invocations, but we were missing a handler for resetting the attributes when run/emulate was killed with CTRL-C.

Thanks!