test(datepicker): fix test failure against view engine (#19273)

Fixes one of the datepicker tests that fails when running against ViewEngine.

Author: crisbeto

src/material/datepicker/date-range-input.spec.ts

@@ -336,6 +336,7 @@ describe('MatDateRangeInput', () => {
 
       formFieldContainer.click();
       fixture.detectChanges();
+      tick();
 
       expect(endInput.focus).toHaveBeenCalled();
     }));