Q_DISABLE_COPY doesn't need a ; at the end

Fixes warnings when -Wpedantic is enabled

Change-Id: I8fcfbfa9bb3a5ab61c85f8cb74660f6f7e459fc0
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Reviewed-by: Alejandro Exojo Piqueras <suy@badopi.org>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>