Revert "Don't unconditionally emit buttonPressed on profile load"

It turns out this code was a fix for Bug 243618 and the bug addressed by
the aforementioned commit was actually caused by KScreen failing to
map the output to a type and then PowerDevil did not prevent lid action
because it didn't see an external screen (it ignores unknown ones).
This has been fixed in KScreen 5.7 already, so we should be all set \o/

This reverts commit 48c3dca61d7cb808c904a3a3659b2cd36fba1866.