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_minimal_cpp_stdlib/BUILD.gn b/pw_minimal_cpp_stdlib/BUILD.gn
index 5f3a6ad..332e18c 100644
--- a/pw_minimal_cpp_stdlib/BUILD.gn
+++ b/pw_minimal_cpp_stdlib/BUILD.gn
@@ -12,12 +12,12 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-# gn-format disable
 import("//build_overrides/pigweed.gni")
 
 import("$dir_pw_build/target_types.gni")
 import("$dir_pw_docgen/docs.gni")
 import("$dir_pw_unit_test/test.gni")
+
 config("include_dirs") {
   include_dirs = [ "public" ]
 }