manifest: Track our own system/extras

Signed-off-by: Jarl-Penguin <jarlpenguin@outlook.com>
Change-Id: I902fedff974f03aee3fa32878afdfb0ff299ef0e

default.xml

@@ -686,7 +686,7 @@
   <project path="system/connectivity/wificond" name="platform/system/connectivity/wificond" groups="pdk" remote="aosp" />
   <project path="system/connectivity/wifilogd" name="platform/system/connectivity/wifilogd" groups="pdk" remote="aosp" />
   <project path="system/core" name="LineageOS/android_system_core" groups="pdk" />
-  <project path="system/extras" name="platform/system/extras" groups="pdk" remote="aosp" />
+  <project path="system/extras" name="LineageOS/android_system_extras" groups="pdk" />
   <project path="system/gatekeeper" name="platform/system/gatekeeper" groups="pdk" remote="aosp" />
   <project path="system/gsid" name="platform/system/gsid" groups="pdk" remote="aosp" />
   <project path="system/hardware/interfaces" name="platform/system/hardware/interfaces" groups="pdk" remote="aosp" />