Pad editor dlg: set the default thermal spoke to 90 deg for RR pad shape

It was 45 deg, but this default value is good for round pads only, not
for rectangular pad shapes.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/21271

pcbnew/board_design_settings.cpp

@@ -1577,4 +1577,9 @@ void BOARD_DESIGN_SETTINGS::SetDefaultMasterPad()
 
     constexpr double RR_RADIUS = DEFAULT_PAD_HEIGTH_MM * DEFAULT_PAD_RR_RADIUS_RATIO;
     m_Pad_Master->SetRoundRectCornerRadius( PADSTACK::ALL_LAYERS, pcbIUScale.mmToIU( RR_RADIUS ) );
+
+    if( m_Pad_Master->GetFrontShape() == PAD_SHAPE::CIRCLE )
+        m_Pad_Master->SetThermalSpokeAngle( ANGLE_45 );
+    else
+        m_Pad_Master->SetThermalSpokeAngle( ANGLE_90 );
 }