ambient: enable personal photos by default

Useful for testing ambient mode on development builds.

BUG=none

Change-Id: I014797dcce9a2ffe62e80e6df196f50d243de8c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443510Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812899}

chromeos/constants/chromeos_features.cc

@@ -46,7 +46,7 @@ constexpr base::FeatureParam<bool> kAmbientModeDefaultFeedEnabled{
     &kAmbientModeFeature, "DefaultFeedEnabled", false};
 
 constexpr base::FeatureParam<bool> kAmbientModePersonalPhotosEnabled{
-    &kAmbientModeFeature, "PersonalPhotosEnabled", false};
+    &kAmbientModeFeature, "PersonalPhotosEnabled", true};
 
 constexpr base::FeatureParam<bool> kAmbientModeFeaturedPhotosEnabled{
     &kAmbientModeFeature, "FeaturedPhotosEnabled", false};