[css-logical-1] Remove new values addition to `text-align`

[cdoublev]

CSS Logical defines start | end as new values addition to text-align but these are already included in the value definition from CSS Text 3 (and 4). When processing extracts from w3c/webref, newValues are appended to value, resulting to start | end | left | [...] | start | end.

What is the reason for keeping these new values in CSS Logical?