Debugger: Fix uninitialized variable.

MemoryView:
- fTrackingMouse wasn't being initialized in the constructor, which would
  lead to the memory view sometimes thinking it was in mouse tracking mode
  immediately when opened.

src/apps/debugger/user_interface/gui/inspector_window/MemoryView.cpp

@@ -58,6 +58,7 @@ MemoryView::MemoryView(::Team* team, Listener* listener)
 	fSelectionStart(0),
 	fSelectionEnd(0),
 	fScrollRunner(NULL),
+	fTrackingMouse(false),
 	fListener(listener)
 {
 	Architecture* architecture = team->GetArchitecture();