debugger: better breakpoint state handling

Removal of a breakpoint while the insertion result was pending worked,
but created a lot of noise about unexpected state transitions.

Change-Id: I6c101ee9d184efb1c44f72cbff99b0481f64b0eb
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/breakhandler.cpp

@@ -1017,6 +1017,8 @@ void BreakHandler::removeBreakpoint(BreakpointModelId id)
     Iterator it = m_storage.find(id);
     BREAK_ASSERT(it != m_storage.end(), return);
     switch (it->state) {
+    case BreakpointRemoveRequested:
+        break;
     case BreakpointInserted:
     case BreakpointInsertProceeding:
         setState(id, BreakpointRemoveRequested);