TF-1844 Fix mailbox not selected in advanced search

(cherry picked from commit 5711f01183f335c4446c7f5c870f5aca6d72e82c)

lib/features/mailbox_dashboard/presentation/styles/advanced_search_input_form_style.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/material.dart';
+
+class AdvancedSearchInputFormStyle {
+  static const TextStyle inputTextStyle = TextStyle(
+    color: Colors.black,
+    fontSize: 16,
+    fontWeight: FontWeight.w400,
+  );
+}

lib/features/mailbox_dashboard/presentation/styles/text_field_autocomplete_email_address_style.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/material.dart';
+
+class TextFieldAutocompleteEmailAddressStyle {
+  static const TextStyle inputTextStyle = TextStyle(
+    color: Colors.black,
+    fontSize: 16,
+    fontWeight: FontWeight.w400,
+  );
+}