Revert "[CCA] Run CCA as SWA by default"

This reverts commit 46b6fd15.

Reason for revert:

camera.CCAUISmoke.fake is failing on chromeos-eve-chrome and camera.CCAUI* is listed as test coverage for this CL, so I am speculating that it is the cause. See:
https://ci.chromium.org/p/chrome/builders/ci/chromeos-eve-chrome/11136

Original change's description:
> [CCA] Run CCA as SWA by default
>
> Bug: b/172345161
> Test: tast run [DUT] camera.CCAUI*
> Change-Id: I10484c9263f3e4c560028aef272cd3db88c47b31
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509834
> Commit-Queue: Wei Lee <wtlee@chromium.org>
> Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Auto-Submit: Wei Lee <wtlee@chromium.org>
> Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825657}

TBR=ortuno@chromium.org,wtlee@chromium.org

Change-Id: I5464fbcd7f1a03cd157122ad66c6ee13ad111630
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/172345161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529360Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825818}

chrome/browser/web_applications/components/external_app_install_features.cc

@@ -40,7 +40,7 @@ const base::Feature kMigrateDefaultChromeAppToWebAppsNonGSuite{
 #if defined(OS_CHROMEOS)
 // Enable or disables running the Camera App as a System Web App.
 const base::Feature kCameraSystemWebApp{"CameraSystemWebApp",
-                                        base::FEATURE_ENABLED_BY_DEFAULT};
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // OS_CHROMEOS
 
 bool IsExternalAppInstallFeatureEnabled(base::StringPiece feature_name) {