Adding tff, otf, woff(2) to custom font extensions

This pull request is to fix #65633

When trying to add a custom font, my '.ttf' and '.otf' fonts were not visible unless I selected 'All files'. By adding these to the custom property info makes it more convenient to select a different font, without doing the extra clicks to select 'All Files'.

Not a big change, but something I wanted to fix as it seems appropriate to do so.

scene/theme/theme_db.cpp

@@ -49,7 +49,7 @@ void ThemeDB::initialize_theme() {
 	ProjectSettings::get_singleton()->set_custom_property_info("gui/theme/custom", PropertyInfo(Variant::STRING, "gui/theme/custom", PROPERTY_HINT_FILE, "*.tres,*.res,*.theme", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED));
 
 	String font_path = GLOBAL_DEF_RST("gui/theme/custom_font", "");
-	ProjectSettings::get_singleton()->set_custom_property_info("gui/theme/custom_font", PropertyInfo(Variant::STRING, "gui/theme/custom_font", PROPERTY_HINT_FILE, "*.tres,*.res", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED));
+	ProjectSettings::get_singleton()->set_custom_property_info("gui/theme/custom_font", PropertyInfo(Variant::STRING, "gui/theme/custom_font", PROPERTY_HINT_FILE, "*.tres,*.res,*.otf,*.ttf,*.woff,*.woff2,*.fnt,*.font,*.pfb,*.pfm", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED));
 
 	TextServer::FontAntialiasing font_antialiasing = (TextServer::FontAntialiasing)(int)GLOBAL_DEF_RST("gui/theme/default_font_antialiasing", 1);
 	ProjectSettings::get_singleton()->set_custom_property_info("gui/theme/default_font_antialiasing", PropertyInfo(Variant::INT, "gui/theme/default_font_antialiasing", PROPERTY_HINT_ENUM, "None,Grayscale,LCD sub-pixel", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED));