ENABLE_TWOLINE_ALLAPPS to true

Need to use old way of changing FeatureFlag flag values in tests since this feature
also uses FeatureFlag.java flag value.

bug: 270390937
Test: presubmit/locally - https://screenshot.googleplex.com/4nCVDPb2yRwW7rh
Flag: turning to ENABLED (been in teamfood in aconfig)
Change-Id: I392de84c6fb84b7a217b953f2335160056b4ecc3