Add additional subtypes, add None option, prefill edit with previously selected option. (#1286)

* Add additional subtypes and allow for None

* Add parens for consistency on 401

* Remove cryptocurrency investment subtype

* Handle nil value

* Use objects current subtype as the initial selection

* Remove "None" option to default to helper prompt

* Fix blank/none selection

* Only include blank if subtype is present

* Simplify investment subtype dropdown

* Improve depository subtype

config/locales/views/accounts/en.yml

@@ -5,6 +5,9 @@ en:
       has_issues: Issue detected.
       troubleshoot: Troubleshoot
     accountables:
+      investment:
+        prompt: Select a subtype
+        none: None
       credit_card:
         annual_fee: Annual fee
         annual_fee_placeholder: '99'
@@ -23,6 +26,9 @@ en:
           expiration_date: Expiration Date
           minimum_payment: Minimum Payment
           unknown: Unknown
+      depository:
+        prompt: Select a subtype
+        none: None
       loan:
         interest_rate: Interest rate
         interest_rate_placeholder: '5.25'