dpwa: Enable clean up for user_display_mode migration bug on M87

This CL turns the DesktopPWAsMigrationUserDisplayModeCleanUp flag on by
default for M87.

See https://chromium-review.googlesource.com/c/chromium/src/+/2391704
for details on the clean up.

Bug: 1127128
Change-Id: I295a5ee95399fdc2e56e1d85c049b612e2fa112c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417469
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808237}

chrome/common/chrome_features.cc

@@ -231,7 +231,7 @@ const base::Feature kDesktopPWAsLocalUpdating{"DesktopPWAsLocalUpdating",
 // cleaning up the fallout of https://crbug.com/1125020.
 const base::Feature kDesktopPWAsMigrationUserDisplayModeCleanUp{
     "DesktopPWAsMigrationUserDisplayModeCleanUp",
-    base::FEATURE_DISABLED_BY_DEFAULT};
+    base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables Desktop PWAs to be auto-started on OS login.
 const base::Feature kDesktopPWAsRunOnOsLogin{"DesktopPWAsRunOnOsLogin",