Fix b/265364351: Light theme icons opacity is too light

https://screenshot.googleplex.com/Avqsw3gb2tjKqrK.png
https://screenshot.googleplex.com/46AZuJMjp2HMyqd.png
https://screenshot.googleplex.com/9mE3XutRUNaGckg.png
https://screenshot.googleplex.com/5rNUKMJjhNBNShZ.png

Bug: 265364351
Fix: 265364351
Test: manual
Change-Id: I7521030f1a5d84cd88027fb84a465623610707fb