Debugger: enable disable breakpoint by clicking

Disabled breakpoints can be enabled by just clicking on them.
Clicking an enabled breakpoint deletes it (just as before).

Change-Id: I651fb0f333d717db245ae0d06fcdfa6888cf8e7d
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/breakhandler.cpp

@@ -120,6 +120,9 @@ public:
     void clicked() final
     {
         QTC_ASSERT(m_bp, return);
+        if (!m_bp->isEnabled())
+            m_bp->setEnabled(true);
+        else
             m_bp->deleteGlobalOrThisBreakpoint();
     }
 
@@ -183,6 +186,9 @@ public:
     void clicked() final
     {
         QTC_ASSERT(m_gbp, return);
+        if (!m_gbp->isEnabled())
+            m_gbp->setEnabled(true);
+        else
             m_gbp->removeBreakpointFromModel();
     }