Tweak fbx2gltf file filter to remove naming restriction

This relaxes the naming restriction on fbx2gltf binaries,
as people may be renaming them then wondering why they've disappeared
from the dialog unless they select "All Files (*)" as a filter.

editor/fbx_importer_manager.cpp

@@ -144,12 +144,8 @@ FBXImporterManager::FBXImporterManager() {
 	browse_dialog = memnew(EditorFileDialog);
 	browse_dialog->set_access(EditorFileDialog::ACCESS_FILESYSTEM);
 	browse_dialog->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
-#if defined(X11_ENABLED)
-	browse_dialog->add_filter("FBX2glTF-linux-x86_64");
-#elif defined(OSX_ENABLED)
-	browse_dialog->add_filter("FBX2glTF-macos-x86_64");
-#elif defined(WINDOWS_ENABLED)
-	browse_dialog->add_filter("FBX2glTF-windows-x86_64");
+#ifdef WINDOWS_ENABLED
+	browse_dialog->add_filter("*.exe");
 #endif
 
 	browse_dialog->connect("file_selected", callable_mp(this, &FBXImporterManager::_select_file));