Add Mauritania Ouguiya (#29670)

From https://github.com/metabase/metabase/issues/29545

shared/src/metabase/shared/util/currency.cljc

@@ -543,6 +543,13 @@
           :rounding 0,
           :code "MOP",
           :name_plural "Macanese patacas"}],
+   [:MRU {:symbol "MRU",
+          :name "Mauritania Ouguiya",
+          :symbol_native "MRU",
+          :decimal_digits 2,
+          :rounding 0,
+          :code "MRU",
+          :name_plural "Mauritania Ouguiyas"}],
    [:MUR {:symbol "MURs",
           :name "Mauritian Rupee",
           :symbol_native "MURs",