Rename Soy map to legacy_object_map (first step of migration)

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=185042097

java/google/registry/ui/soy/registrar/Domain.soy

@@ -163,7 +163,7 @@
 
 /** Renders an input form row for a specific type of contact. */
 {template .showContact_ visibility="private"}
-  {@param contacts: list<map<string, ?>>} /** List of EPP domain:contacts. */
+  {@param contacts: list<legacy_object_map<string, ?>>} /** List of EPP domain:contacts. */
   {@param type: string} /** Type of contact (e.g. admin, tech) */
   {for $contact in $contacts}
     {if $type == $contact['@type']}