DEPS: Remove use_relative_hooks.

This flag is deprecated and folded into use_relative_paths.

Bug: chromium:1107325
Change-Id: I2bb185185d2d345d5acb5e51142cde0e2cfee3cf
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2324601
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>

Author: null77

DEPS

@@ -4,7 +4,6 @@
 
 # Avoids the need for a custom root variable.
 use_relative_paths = True
-use_relative_hooks = True
 
 gclient_gn_args_file = 'build/config/gclient_args.gni'
 gclient_gn_args = [