Update video URL for youtube 1p3p Flicker tests

Fixes an issue with Flicker tests failing due to test video being
privated. This uses the most viewed video on the Google youtube
account.

Test: atest WMShellFlickerTestsPipApps:YouTubeEnterPipTest
Bug: b/344807340
Flag: EXEMPT bugfix
Change-Id: Id98404523e928ac4875cc4ef3df4d4e30217fc2b