refactor(1password): extract opswd function

plugins/1password/_opswd

@@ -0,0 +1,9 @@
+#compdef opswd
+
+function _opswd() {
+  local -a services
+  services=("${(@f)$(op list items --categories Login 2>/dev/null | op get item - --fields title 2>/dev/null)}")
+  [[ -z "$services" ]] || compadd -a -- services
+}
+
+_opswd "$@"