fix(gui): initialize use_selected_only_ in stub constructor

Signed-off-by: alokkumardalei-wq <alokkumardalei2@gmail.com>

Author: alokkumardalei-wq

src/gui/src/stub_heatMap.cpp

@@ -35,6 +35,7 @@ HeatMapDataSource::HeatMapDataSource(utl::Logger* logger,
       reverse_log_(false),
       show_numbers_(false),
       show_legend_(false),
+      use_selected_only_(false),
       color_generator_(SpectrumGenerator(100.0))
 {
 }