alot: set primary email first (#1826)

Alot uses the first email in the config as primary email. Because the
order in which the email.accounts were sorted was alphabetical, the account
set to `primary = true` was not put first in the alot config and thus
not considered as primary email for alot.

This was fixed by sorting the email accounts again such that accounts
with `primary = true` come first.

modules/programs/alot.nix

@@ -7,9 +7,12 @@ let
 
   cfg = config.programs.alot;
 
-  alotAccounts =
+  enabledAccounts =
     filter (a: a.notmuch.enable) (attrValues config.accounts.email.accounts);
 
+  # sorted: primary first
+  alotAccounts = sort (a: b: !(a.primary -> b.primary)) enabledAccounts;
+
   boolStr = v: if v then "True" else "False";
 
   mkKeyValue = key: value: