Fix wxWidgets check for EGL support

Since wxWidgets's d9df7db130ac22a6691bc4eb73ad0f691e999d7b,
wxWidgets can be compiled with both GLX and EGL at the same time, in
which case the old check no longer works.

Author: arch1t3cht

src/main.cpp

@@ -101,7 +101,7 @@ AegisubApp::AegisubApp() {
 
 	// Fallback to X11 if wxGTK implementation is build without Wayland EGL support
 	// Fix https://github.com/TypesettingTools/Aegisub/issues/233
-	#if defined(__WXGTK__) && !wxUSE_GLCANVAS_EGL
+	#if defined(__WXGTK__) && !wxUSE_GLCANVAS_EGL && !wxHAS_EGL
 		wxString xdg_session_type = wxGetenv("XDG_SESSION_TYPE");
 		wxString wayland_display  = wxGetenv("WAYLAND_DISPLAY");