LibGUI: Use new Bitmap::is_path_a_supported_image_format method

Author: https://github.com/asliturk
Commit: 0799835e15
Pull-request: https://github.com/SerenityOS/serenity/pull/2557
Reviewed-by: https://github.com/bugaevc

Libraries/LibGUI/FilePicker.cpp

@@ -269,7 +269,7 @@ FilePicker::~FilePicker()
 
 void FilePicker::set_preview(const LexicalPath& path)
 {
-    if (path.has_extension(".png")) {
+    if (Gfx::Bitmap::is_path_a_supported_image_format(path.string())) {
         auto bitmap = Gfx::Bitmap::load_from_file(path.string());
         if (!bitmap) {
             clear_preview();

Libraries/LibGUI/FileSystemModel.cpp

@@ -460,7 +460,7 @@ Icon FileSystemModel::icon_for_file(const mode_t mode, const String& name) const
 
 Icon FileSystemModel::icon_for(const Node& node) const
 {
-    if (node.name.to_lowercase().ends_with(".png") || node.name.to_lowercase().ends_with(".gif")) {
+    if (Gfx::Bitmap::is_path_a_supported_image_format(node.name.to_lowercase())) {
         if (!node.thumbnail) {
             if (!const_cast<FileSystemModel*>(this)->fetch_thumbnail_for(node))
                 return m_filetype_image_icon;