Debugger: Fix jump to file/line breakpoint from disassembler

Triggered by double-clicking a normal source file+line breakpoint
while looking at some disassembly: We want to jump to the original
source file in that case.

Change-Id: Ia6eddcaf27e4160c7a989ab757315f5314f65d1e
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>