basic: pimplify that

Change-Id: I0abe66ded0fd69a2720ad64e1a1426aafc7dfffb
basic: move SbxAppData to a BasicDLL member

... so it is deleted by ~SfxApplication.

Change-Id: I161bd92eb9b5082d1fdeea603921d0372a4d97e6
fdo#84935: basic: avoid silly SolarMutex asserts on exit on Mac

Change-Id: If22b8ff962d2b68130176de3b7b9eccacfc850dc