lineage: Switch to our system/update_engine fork

Change-Id: Id894a2e13274a7623e9ddea95ece1a5fe3b43f8b

default.xml

@@ -716,7 +716,7 @@
   <project path="system/tools/mkbootimg" name="platform/system/tools/mkbootimg" groups="pdk" remote="aosp" />
   <project path="system/tools/sysprop" name="platform/system/tools/sysprop" groups="pdk" remote="aosp" />
   <project path="system/tools/xsdc" name="platform/system/tools/xsdc" groups="pdk" remote="aosp" />
-  <project path="system/update_engine" name="platform/system/update_engine" groups="pdk" remote="aosp" />
+  <project path="system/update_engine" name="LineageOS/android_system_update_engine" groups="pdk" />
   <project path="system/vold" name="LineageOS/android_system_vold" groups="pdk" />
   <project path="test/app_compat/csuite" name="platform/test/app_compat/csuite" remote="aosp" />
   <project path="test/framework" name="platform/test/framework" groups="vts,projectarch,pdk" remote="aosp" />