Remove GuiStyleProp

vendor/raylib/raygui.odin

@@ -28,13 +28,6 @@ when ODIN_OS == .Windows {
 
 RAYGUI_VERSION :: "4.0"
 
-// Style property
-GuiStyleProp :: struct {
-	controlId:     u16,
-	propertyId:    u16,
-	propertyValue: c.int,
-}
-
 // Gui control state
 GuiState :: enum c.int {
 	STATE_NORMAL = 0,