[fuchsia-pkg] Remove deprecated_base_pkg_url for dev_token_manager build.

The package url is already updated in all the tests (tests/modular_tests.json, and
tests/sessionctl) where this component is being used.

TESTED = Run existing modular integration tests using the following cmd:
         fx shell /pkgfs/packages/modular_tests/0/test/run_modular_tests.sh

Change-Id: I38186d7660805c16632d34a5fc0e40c39d3cfd9e
diff --git a/bin/token_manager/BUILD.gn b/bin/token_manager/BUILD.gn
index 65e850e..b632f45 100644
--- a/bin/token_manager/BUILD.gn
+++ b/bin/token_manager/BUILD.gn
@@ -5,8 +5,6 @@
 import("//peridot/build/executable_package.gni")
 
 executable_package("dev_token_manager") {
-  deprecated_bare_package_url = "//build"
-
   meta = [
     {
       path = "meta/dev_token_manager.cmx"