proc: Continue should always work after CallFunction

Continue did not resume execution after a call to CallFunction if the
point where the process was stopped, before the call CallFunction, was
a breakpoint.

Fixes #1374

pkg/proc/proc.go

@@ -281,7 +281,7 @@ func stepInstructionOut(dbp Process, curthread Thread, fnname1, fnname2 string)
 			if g := dbp.SelectedGoroutine(); g != nil {
 				g.CurrentLoc = *loc
 			}
-			return nil
+			return curthread.SetCurrentBreakpoint()
 		}
 	}
 }