Simplify fish init script

templates/fish.txt

@@ -102,20 +102,15 @@ end
 {%- match cmd %}
 {%- when Some with (cmd) %}
 
-# Remove definitions.
+function {{cmd}}
-function __zoxide_unset
+    __zoxide_z $argv
-    set --erase $argv >/dev/null 2>&1
-    abbr --erase $argv >/dev/null 2>&1
-    builtin functions --erase $argv >/dev/null 2>&1
 end
-
-__zoxide_unset {{cmd}}
-alias {{cmd}}=__zoxide_z
 complete -c {{cmd}} -e
 complete -c {{cmd}} -f -a '(__zoxide_z_complete)'
 
-__zoxide_unset {{cmd}}i
+function {{cmd}}i
-alias {{cmd}}i=__zoxide_zi
+    __zoxide_zi $argv
+end
 
 {%- when None %}