Bug 9284 - JavaScript should follow rules recommended by JSHint

Bug 9284 - JavaScript should follow rules recommended by JSHint

Coding style corrections to members.js:

- Mixed tab/space indentation converted to spaces.
- Converted "!=" and "==" to "!==" and "===" for comparisons with ''.
- Adding missing semicolons.

To test, create or edit a patron and confirm that validation hasn't been
broken by the changes to members.js: Invalid date, empty required
fields, guarantor popup, restricted-until field display, etc.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>