Update turn signals ON color

Co-authored-by: M. Fatih Cırıt <xmfcx@users.noreply.github.com>

Author: KhalilSelyan

common/autoware_overlay_rviz_plugin/autoware_overlay_rviz_plugin/src/signal_display.cpp

@@ -47,7 +47,7 @@ SignalDisplay::SignalDisplay()
   property_top_ = new rviz_common::properties::IntProperty(
     "Top", 10, "Top position of the overlay", this, SLOT(updateOverlayPosition()));
   property_signal_color_ = new rviz_common::properties::ColorProperty(
-    "Signal Color", QColor("25, 18, 89"), "Color of the signal arrows", this,
+    "Signal Color", QColor(QString("#00E678")), "Color of the signal arrows", this,
     SLOT(updateOverlayColor()));
 
   // Initialize the component displays