fix(pause): force visibility of the main menu

It make sure that the menu will be visible when the pause view
is started with the character menu selected

sonic-radiance.love/scenes/overworld/screens/mainmenu/pause.lua

@@ -50,6 +50,7 @@ function PauseScreen:setMenu()
   self.scene.menusystem.menus["character"].isLocked = true
 
   self.scene.menusystem:switchMenu(self.menuSelected)
+  self.scene.menusystem.menus["main"].isVisible = true
   if (self.widgetSelected ~= nil) then
     self.scene.menusystem.menus[self.menuSelected].widget.selected = self.widgetSelected
   end