Revert "Disable test flaky FingerprintSetupTest.FingerprintSetupCancel"

This reverts commit 64014850.

Reason for revert: The issue should've been fixed with CL:1868769

Original change's description:
> Disable test flaky FingerprintSetupTest.FingerprintSetupCancel
> 
> FingerprintSetupTest.FingerprintSetupCancel is very flaky on ChromeOS
> since 2019/10/16.
> 
> https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyTQsSBUZsYWtlIkJjaHJvbWl1bUBicm93c2VyX3Rlc3RzQEZpbmdlcnByaW50U2V0dXBUZXN0LkZpbmdlcnByaW50U2V0dXBDYW5jZWwM&show_all_occurrences=1
> 
> TBR=tbarzic@chromium.org
> 
> Bug: 1015014
> Change-Id: Id4210e6317067a5716212a12937ee079f562b4e9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867198
> Reviewed-by: Lan Wei <lanwei@chromium.org>
> Commit-Queue: Lan Wei <lanwei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#707041}

TBR=lanwei@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1015014
Change-Id: Ic75f35608fccd86db16e7c4f1e75dd626d237272
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871696Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708118}

chrome/browser/chromeos/login/screens/fingerprint_setup_browsertest.cc

@@ -166,7 +166,7 @@ IN_PROC_BROWSER_TEST_F(FingerprintSetupTest, FingerprintSetupScreenElements) {
       {"fingerprint-setup-impl", "setupFingerprint"});
 }
 
-IN_PROC_BROWSER_TEST_F(FingerprintSetupTest, DISABLED_FingerprintSetupCancel) {
+IN_PROC_BROWSER_TEST_F(FingerprintSetupTest, FingerprintSetupCancel) {
   quick_unlock::EnabledForTesting(true);
   fingerprint_setup_screen_->Show();
   OobeScreenWaiter(FingerprintSetupScreenView::kScreenId).Wait();