tdf#92110 KDE4: cleanup IsNativeControlSupported
tdf#92110 KDE4: cleanup IsNativeControlSupported

Be (more) correct about the widgets and parts, we actually can draw
natively in KDE4.

Also add an assert, so drawNativeControl won't be called with values
not supported by IsNativeControlSupported.

Change-Id: Iac6c78194191a9cd059ace560c285263ce7c1045

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core