BUILD.gn files: Improve import formatting

The "# gn-format disable" comments are no longer necessary. Delete these
comments and reformat with a Vim macro and gn format.

Change-Id: Ia62c40ad73eef91187d0d443d6e3b0fa723e5aa9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/21380
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Wyatt Hepler <hepler@google.com>
diff --git a/pw_build/target_types.gni b/pw_build/target_types.gni
index 80ffd2a..a451cb2 100644
--- a/pw_build/target_types.gni
+++ b/pw_build/target_types.gni
@@ -12,8 +12,8 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-# gn-format disable
 import("//build_overrides/pigweed.gni")
+
 declare_args() {
   # The name of the GN target type used to build Pigweed executables.
   #
@@ -186,6 +186,7 @@
 
   target(pw_build_EXECUTABLE_TARGET_TYPE, target_name) {
     import("$dir_pw_build/defaults.gni")
+
     forward_variables_from(invoker, "*", _supported_toolchain_defaults)
 
     if (!defined(configs)) {