Remove clamp macro

Doesn't really need to exist since  all it's doing is inlining std::clamp.

src/NotesLoaderKSF.cpp

@@ -349,7 +349,7 @@ static bool LoadFromKSFFile( const RString &sPath, Steps &out, Song &song, bool
 				// duh
 				iTickCount = static_cast<int>(numTemp);
 				// I have been owned by the man -DaisuMaster
-				stepsTiming.SetTickcountAtBeat( fCurBeat, clamp(iTickCount, 0, ROWS_PER_BEAT) );
+				stepsTiming.SetTickcountAtBeat( fCurBeat, std::clamp(iTickCount, 0, ROWS_PER_BEAT) );
 			}
 			else if (BeginsWith(sRowString, "|B"))
 			{