Fix hover state of Resent Search button on Issue List page

Summary

In Issues List view, on the search bar when hovering over recent searches you get a blue right border vs. the expected grey hover state you get on like controls (for example, see filter control to the right of same search bar)

Improvements

Eliminate the odd blue line, at minimum. Consider using the grey flood hover state,

Blue line on hover:

Example of grey hover state: