Fixes context for tiles without longClick

QSTile can declare whether it doesn't support (has no effect) long click
and then TalkBack will not report it as an available option.

Test: manual & atest
Change-Id: Iec21181f4308c7c8c4962f191fa0787e053ae944
Merged-In: Iec21181f4308c7c8c4962f191fa0787e053ae944
Fixes: 117921787