Improve the Search CSR Engine dialog by explicitly including a search/find button

1) Add an explicit Search/Find button to the Search CSR Engine dialog and make it the default button when the Enter/Return key is pressed. For example, if I click/tab out of the search field to check the Open CSRs Only checkbox, I have to click/tab back in the Search Value field to initiate a search.

2) Consolidate the Search By radio buttons in a dropdown.