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

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

src/misc_gui.cpp

@@ -997,7 +997,7 @@ struct QueryStringWindow : public Window
 	{
 		char *last_of = &this->editbox.text.buf[this->editbox.text.max_bytes - 1];
 		GetString(this->editbox.text.buf, str, last_of);
-		str_validate(this->editbox.text.buf, last_of, SVS_NONE);
+		StrMakeValidInPlace(this->editbox.text.buf, last_of, SVS_NONE);
 
 		/* Make sure the name isn't too long for the text buffer in the number of
 		 * characters (not bytes). max_chars also counts the '\0' characters. */