fixed case insensitive compare

radio/src/gui/colorlcd/theme_manager.cpp

@@ -258,7 +258,7 @@ void ThemePersistance::scanForThemes()
       std::string fname(fno.fname);
       auto found = fname.find('.');
       if (found != std::string::npos) {
-        if (fname.substr(found) != ".yml") continue;
+        if (strcasecmp(fname.substr(found).c_str(), YAML_EXT) != 0) continue;
       }
 
       themes.emplace_back(new ThemeFile(fno.fname));

radio/src/gui/colorlcd/theme_manager.h

@@ -21,6 +21,8 @@
 #pragma once
 #include <stdlib.h>
 #include <list>
+#include <string>
+#include <locale>
 #include "sdcard.h"
 #include "colors.h"
 #include "str_functions.h"