AP-5349: Update AddDetailsController tests

Use strings when sending and ensure parameters are named
the same as in the controller use

spec/requests/providers/means/capital_disregards/add_details_controller_spec.rb

@@ -36,9 +36,9 @@
         capital_disregard: {
           amount:,
           account_name:,
-          date_received_3i:,
-          date_received_2i:,
-          date_received_1i:,
+          "date_received(3i)": date_received_3i,
+          "date_received(2i)": date_received_2i,
+          "date_received(1i)": date_received_1i,
         },
         continue_button: "Save and continue",
       }
@@ -68,10 +68,9 @@
       context "with valid params" do
         let(:amount) { 1234 }
         let(:account_name) { "Account name" }
-        let(:date_received) { Date.new(2024, 2, 1) }
-        let(:date_received_3i) { date_received.day }
-        let(:date_received_2i) { date_received.month }
-        let(:date_received_1i) { date_received.year }
+        let(:date_received_3i) { "1" }
+        let(:date_received_2i) { "2" }
+        let(:date_received_1i) { "2024" }
 
         it "redirects to the next page" do
           expect(response).to have_http_status(:redirect)