Revert "Disable test: testSelectSuggestionHidesKeyboardAccessory"

This reverts commit a5a16ad6fa4cc1da559f3fa7a40af0958f0ab9e3.

Reason for revert: The underlying issue should be fixed since end of last week: https://crrev.com/c/1539051/6/chrome/android/javatests/src/org/chromium/chrome/browser/autofill/keyboard_accessory/AutofillKeyboardAccessoryIntegrationTest.java

If it keeps failing, I'll disable it again.
(This revert won't skip any tests/presubmits.)

Original change's description:
> Disable test: testSelectSuggestionHidesKeyboardAccessory
> 
> TBR=fhorschig@chromium.org
> 
> Bug: 947696
> Change-Id: I061658d4c7771ffc445a83feb135bdfacad1b1c7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545962
> Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
> Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#646198}

TBR=shimazu@chromium.org

Bug: 947696
Change-Id: I680ad7dc8d606143c496b55819f0151eaa4adaf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1546108
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646323}