fix(material/autocomplete): update style.bottom value for broken test

Fixes breaking Angular Component Autocomplete comoponent's autocomplete
spec.ts so that the value falls within an acceptable range based on the
new behavior of the autocomplete in landscape mode.

Fixes b/284148377

Author: essjay05

src/material/autocomplete/autocomplete.spec.ts

@@ -2172,7 +2172,7 @@ describe('MDC-based MatAutocomplete', () => {
         let inputReference = fixture.debugElement.query(By.css('.mdc-text-field'))!.nativeElement;
 
         // Push the element down so it has a little bit of space, but not enough to render.
-        inputReference.style.bottom = '75px';
+        inputReference.style.bottom = '100px';
         inputReference.style.position = 'fixed';
 
         dispatchFakeEvent(inputEl, 'focusin');