[AW NS] Remove AwSettingsTest.testCacheMode from the filter

The AwSettingsTest.testCacheMode is now passing due to:
https://chromium-review.googlesource.com/c/chromium/src/+/1339720

BUG=893570,841556
TBR=ntfschr@chromium.org,cduvall@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo

Change-Id: Icd210dcfaf8d5830f1128834e3ea16d58c179569
Reviewed-on: https://chromium-review.googlesource.com/c/1352786
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611669}

testing/buildbot/filters/mojo.fyi.network_webview_instrumentation_test_apk.filter

@@ -69,7 +69,6 @@
 -org.chromium.android_webview.test.AwSettingsTest.testAssetUrl
 -org.chromium.android_webview.test.AwSettingsTest.testBlockNetworkLoadsWithAudio
 -org.chromium.android_webview.test.AwSettingsTest.testBlockNetworkLoadsWithHttpResources
--org.chromium.android_webview.test.AwSettingsTest.testCacheMode
 -org.chromium.android_webview.test.AwSettingsTest.testCacheModeWithBlockedNetworkLoads
 -org.chromium.android_webview.test.AwSettingsTest.testContentUrlAccessWithTwoViews
 -org.chromium.android_webview.test.AwSettingsTest.testContentUrlFromFileWithTwoViews