fix(alot): remove esc = exit from search mode

In the inbox/search view, exit has nowhere to go back to so it quit
alot entirely. Esc is now only bound in thread/taglist/bufferlist where
it navigates back without closing the application.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

alot/config

@@ -7,8 +7,6 @@
         draft_box       = maildir:///home/themiro/Mail/Drafts
 
 [bindings]
-    [[search]]
-        esc = exit
     [[thread]]
         esc = exit
     [[taglist]]