finally got theme deletion working + qr stuff

Theme deletion [SDMC] now works, although no button currently has it assigned. The QR reader now works properly with Unicode filenames.

source/camera.c

@@ -221,7 +221,7 @@ Result http_get(char *url, char *path)
     remake_file(path_to_file, ArchiveSD, size);
     buf_to_file(size, path_to_file, ArchiveSD, (char*)buf);
 
-    add_theme(&themes_list, &theme_count, path_to_file, filename);
+    get_themes(&themes_list, &theme_count);
 
     exit_qr();