Squish: Fix painting location marker

Change-Id: Id0b36fe2c0b960a63415445b2e718688ea129da0
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/squish/squishtools.cpp

@@ -61,6 +61,7 @@ public:
     SquishLocationMark(const FilePath &filePath, int line)
         : TextEditor::TextMark(filePath, line, Id("Squish.LocationMark"))
     {
+        setIsLocationMarker(true);
         setIcon(Debugger::Icons::LOCATION.icon());
         setPriority(HighPriority);
     }