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

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

src/script/api/script_object.cpp

@@ -283,7 +283,7 @@ ScriptObject::ActiveInstance::~ActiveInstance()
 {
 	char buffer[64];
 	::GetString(buffer, string, lastof(buffer));
-	::str_validate(buffer, lastof(buffer), SVS_NONE);
+	::StrMakeValidInPlace(buffer, lastof(buffer), SVS_NONE);
 	return ::stredup(buffer);
 }
 
@@ -312,7 +312,7 @@ ScriptObject::ActiveInstance::~ActiveInstance()
 	if (!StrEmpty(text) && (GetCommandFlags(cmd) & CMD_STR_CTRL) == 0) {
 		/* The string must be valid, i.e. not contain special codes. Since some
 		 * can be made with GSText, make sure the control codes are removed. */
-		::str_validate(const_cast<char *>(text), text + strlen(text), SVS_NONE);
+		::StrMakeValidInPlace(text, SVS_NONE);
 	}
 
 	/* Set the default callback to return a true/false result of the DoCommand */