fix restore backup option

src/gui/editControls.cpp

@@ -524,6 +524,11 @@ void FurnaceGUI::drawMobileControls() {
             openFileDialog(GUI_FILE_EXPORT_CMDSTREAM);
           }
 
+          if (ImGui::Button("Restore Backup")) {
+            mobileMenuOpen=false;
+            doAction(GUI_ACTION_OPEN_BACKUP);
+          }
+
           ImGui::Separator();
 
           if (ImGui::BeginTabBar("MobileSong")) {

src/gui/gui.cpp

@@ -1483,7 +1483,7 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
         "Restore Backup",
         {"Furnace song", "*.fur"},
         "Furnace song{.fur}",
-        backupPath,
+        backupPath+String(DIR_SEPARATOR_STR),
         dpiScale
       );
       break;