[FIX] web: wrong tests

This commit fixes two tests that became meaningless after tweaks
in production code:

 - form_tests: use two char fields, as integer fields can't be
   unset since rev. c62a4edcb
 - pivot_tests: the button is disabled since rev. 4f4f111, but
   simulating a click with jQuery bypasses the disabled attribute

This commit also removes unecessary overrides of mockRPC. Those
overrides existed  because the attachments part of the sidebar
used to make a search_read RPC, but this has been removed at rev.
1dbb555.

closes odoo/odoo#28651

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