Codechange: rename str_validate to StrMakeValid(InPlace) (#9304)

This to be more explicit the function changes the value, and not
returns yes/no.

src/highscore.cpp

@@ -170,7 +170,7 @@ void LoadFromHighScore()
 					i = SP_SAVED_HIGHSCORE_END;
 					break;
 				}
-				str_validate(hs->company, lastof(hs->company), SVS_NONE);
+				StrMakeValidInPlace(hs->company, lastof(hs->company), SVS_NONE);
 				hs->title = EndGameGetPerformanceTitleFromValue(hs->score);
 			}
 		}