Comment 3 for bug 1819236

Fixes pushed:

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1819236-ang-cat-kw-starts-with

This 1) disables the options when keyword is selected and 2) changes the match op to the 'contains' operator in cases where it was set prior to flipping the search class selector back to keyword.