Stop snapshot stops original debugger as well

Steps to reproduce:

• have a project open, start simple cpp debugging
• at some bp take a snapshot
  • QC adds another "debugger preset" derived from the running one with additional "- snapshot" suffix
  • you now should have 2 presets - one holding the original debugger / debuggee and the snapshot thingy
• stop the snapshot (Stop debugging)
  • QC brings up a strange error message

Application process could not be stopped:
You can't do that without a process to debug. 

• • QC stops the original debugging process as well

Expected:

• QC stops the snapshot (without error message)
• QC leaves the original debugger preset alone, so that is possible to continue there