SystemUI: Increase hdpi/mdpi statusbar header margins

Conflicts:
	packages/SystemUI/res/layout-hdpi/status_bar_expanded_header.xml
	packages/SystemUI/res/layout-mdpi/status_bar_expanded_header.xml
Fix hdpi/mdpi statusbar cut-offs
Previously, the QS/NOTIFICATION toggle was cut-off when halo and clear-all button were aviable at the same time

Conflicts:
	packages/SystemUI/res/layout-hdpi/status_bar_expanded_header.xml
	packages/SystemUI/res/layout-mdpi/status_bar_expanded_header.xml