Fix for Android 4.1 nth-of-type bug

in the Android 4.1 browser nth-of-type(n) is not recognized by the parser but nth-of-type(1n) apparently is. This fixes an issue where a smaller breakpoint clearing bleeds through to the larger breakpoints and adds additional clears. This can be recreated on the block grid documentation page
Merge pull request #5084 from ithinkdancan/5.3-wip

Fix for Android 4.1 nth-of-type bug