Add Traceur app to aosp repo manifest.

Test: Saw the Traceur app repo inside packages/apps after a repo sync.
Bug: 68207033
Change-Id: I5c90950f3dae5553ae44e1d2eb86f4442f5ea696

default.xml

@@ -502,6 +502,7 @@
   <project path="packages/apps/TimeZoneData" name="platform/packages/apps/TimeZoneData" groups="pdk" />
   <project path="packages/apps/TimeZoneUpdater" name="platform/packages/apps/TimeZoneUpdater" groups="pdk" />
   <project path="packages/apps/Test/connectivity" name="platform/packages/apps/Test/connectivity" groups="pdk" />
+  <project path="packages/apps/Traceur" name="platform/packages/apps/Traceur" groups="pdk" />
   <project path="packages/apps/TvSettings" name="platform/packages/apps/TvSettings" groups="pdk-fs" />
   <project path="packages/apps/TV" name="platform/packages/apps/TV" />
   <project path="packages/apps/UnifiedEmail" name="platform/packages/apps/UnifiedEmail" groups="pdk-fs" />