fix(SideMenu/BackLink): set icon size to 14 (#2080)
fix(SideMenu/BackLink): set icon size to 14 (#2080)

after icons were migrated their sizes changed and so this one in
SideMenu got bigger
wix/wix-style-react,wix/wix-style-react,wix/wix-style-react,wix/wix-style-react