Code cleanup.

tests/Unit/Import/Mapper/OpposingAccountsTest.php

@@ -59,7 +59,7 @@ class OpposingAccountsTest extends TestCase
         $this->assertCount(3, $mapping);
         // assert this is what the result looks like:
         $result = [
-            0  => strval(trans('import.map_do_not_map')),
+            0  => (string)trans('import.map_do_not_map'),
             9  => 'Else',
             13 => 'Something (IBAN)',
         ];