remove references to *_icon_buf

[agodie]

Changes done in https://github.com/serialoverflow/blockify/commit/b30ebedb86d32afbfa6af3fa1e4b10a3acf1ece6 removed variables red_icon_buf and blue_icon_buf. These were used in other parts in the gui module, causing an exception during the exception (when ads popped up). I therefore commented the lines referencing the missing variables and the problem seems to be solved (exception doesn't raise anymore).