config: clamp resolution scale to 0.25-2.0

UnleashedRecomp/config.cpp

@@ -49,6 +49,8 @@ void Config::Load()
     {
         printf("Failed to parse configuration: %s\n", err.what());
     }
+
+    ResolutionScale = std::clamp(ResolutionScale, 0.25f, 2.0f);
 }
 
 void Config::Save()

UnleashedRecomp/stdafx.h

@@ -3,6 +3,7 @@
 #define NOMINMAX
 
 #include <windows.h>
+#include <algorithm>
 #include <mutex>
 #include <vector>
 #include <string>