Add BDD test for deleting currencies with short codes

Tests deletion of a currency with a code of only a single character.
Previously this failed.

xt/66-cucumber/05-settings/currency.feature

@@ -41,8 +41,7 @@ Scenario: Delete a currency
   Then I should see the Edit currencies screen
    And I expect the report to contain 2 rows
 
-
-Scenario: Delete an exchange rate containing query string characters
+Scenario: Delete a currency containing query string characters
  Given the following currency:
      | currency | description    |
      | &&?      | test currency  |
@@ -53,3 +52,14 @@ Scenario: Delete an exchange rate containing query string characters
   Then I should see the Edit currencies screen
    And I expect the report to contain 3 rows
 
+Scenario: Delete a currency with less than three characters
+ Given the following currency:
+     | currency | description    |
+     | A        | test currency  |
+  When I navigate the menu and select the item at "System > Currency > Edit currencies"
+  Then I should see the Edit currencies screen
+   And I expect the report to contain 4 rows
+  When I click "[delete]" for the row with ID "A"
+  Then I should see the Edit currencies screen
+   And I expect the report to contain 3 rows
+