Connection.h: fix build-breaking typo in include: Qtcore -> QtCore.
Connection.h: fix build-breaking typo in include: Qtcore -> QtCore.

Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble