Exclude testExternalStorageProviderAndDownloadsProvider for Wear OS

Mount mode tests for External Storage Provider and Downloads Provider
are skipped since these providers are not supported on Wear OS.

Bug: 254390959
Test: atest CtsScopedStorageDeviceOnlyTest#
testExternalStorageProviderAndDownloadsProvider

Change-Id: Icb4224e433f4a7d3f98c68c4086fe71014c7f051
1 file changed