Add a "quick-edit" button for the current server host/ip, if it's custom

This was requested by Majin on Discord, whose server changes IP
regularly for some reason.

UI/UIAtlas.cpp

@@ -187,6 +187,7 @@ static const ImageMeta imageIDs[] = {
 	{"I_FILE_SAVE", false},
 	{"I_RADIO_EMPTY", false},
 	{"I_RADIO_SELECTED", false},
+	{"I_EDIT_TEXT", false},
 };
 
 static std::string PNGNameFromID(std::string_view id) {