[lldb] Always listen for progress events in the default event handler

We came to the conclusion that this doesn't matter for VSCode/Xcode
because they don't use the default event loop and that other clients
who might care should use the setting.

Differential revision: https://reviews.llvm.org/D120972

(cherry picked from commit c24199e)

Author: JDevlieghere

lldb/source/Core/Debugger.cpp

@@ -1683,10 +1683,8 @@ void Debugger::DefaultEventHandler() {
           CommandInterpreter::eBroadcastBitAsynchronousOutputData |
           CommandInterpreter::eBroadcastBitAsynchronousErrorData);
 
-  if (!m_broadcaster.EventTypeHasListeners(Debugger::eBroadcastBitProgress)) {
-    listener_sp->StartListeningForEvents(&m_broadcaster,
-                                         Debugger::eBroadcastBitProgress);
-  }
+  listener_sp->StartListeningForEvents(&m_broadcaster,
+                                       Debugger::eBroadcastBitProgress);
 
   // Let the thread that spawned us know that we have started up and that we
   // are now listening to all required events so no events get missed