Get back Twitter icon

Elon Musk changed the icon of Twitter to "X". This extension reverts the change. Change Log: Ver 1.1.0: Add feature to control favicon and in-page icon separately. Add "No Change" item to icon setting. Add setting option about replacing page title. Fix some bugs. Ver 1.0.3: Support x.com. Ver 1.0.2: Fix size of one of icon. Fix problem about modifing the icon on the page. Ver. 1.0.1: Make it possible to select the icon of tabs. Add feature to modify the icon on the page. Ver. 1.0.0: First Publish.