Restore removed <algorithm> includes.

Turns out these were needed after all. For some reason, on Windows and
Mac, <algorithm> gets auto-included by something else so I don't notice
when it's missing, and MSVC's include dependency tracker doesn't see it
either.

Core/Dialog/PSPGamedataInstallDialog.cpp

@@ -15,10 +15,10 @@
 // Official git repository and contact information can be found at
 // https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
 
+#include <algorithm>
 #include "Common/CommonTypes.h"
 #include "Common/Serialize/Serializer.h"
 #include "Common/Serialize/SerializeFuncs.h"
-#include "Common/System/OSD.h"
 #include "Core/ELF/ParamSFO.h"
 #include "Core/MemMapHelpers.h"
 #include "Core/Reporting.h"