Prevent loading of psqlrc when listing databases

Users have the ability to override the way records are displayed in psql by
changing the format[1] and linestyle[2] settings. These settings also affect the
output of psql commands used for autocompletion, like listing databases and
users - so they inadvertantly break Fish's completion.

If we suppress the loading of psqlrc[3] the default settings are used instead.

[1] https://www.postgresql.org/docs/current/app-psql.html#APP-PSQL-META-COMMAND-PSET-FORMAT
[2] https://www.postgresql.org/docs/current/app-psql.html#APP-PSQL-META-COMMAND-PSET-LINESTYLE
[3] https://www.postgresql.org/docs/current/app-psql.html#APP-PSQL-OPTION-NO-PSQLRC

share/functions/__fish_complete_pg_database.fish

@@ -1,3 +1,3 @@
 function __fish_complete_pg_database
-    psql -AtqwlF \t 2>/dev/null | awk 'NF > 1 { print $1 }'
+    psql -AtqwlXF \t 2>/dev/null | awk 'NF > 1 { print $1 }'
 end

share/functions/__fish_complete_pg_user.fish

@@ -1,3 +1,3 @@
 function __fish_complete_pg_user
-    psql -Atqwc 'select usename from pg_user' template1 2>/dev/null
+    psql -AtqwXc 'select usename from pg_user' template1 2>/dev/null
 end