Temporarily disable shapes flag in image and device dump tests.

Will re-enable after more shapes changes, as part of b/396211437

Bug: 396211437
Bug: 395952745
Flag: com.android.launcher3.enable_launcher_icon_shapes
Test: Presubmit
Change-Id: Ib0c85167df2723632adce9dadae718a2a1b7b757