Fixed license version to be inline with Drupal core.

Author: AlexSkrypnyk

.gitattributes

@@ -20,4 +20,4 @@
 
 # Remove the lines below in your project.
 .github/FUNDING.yml export-ignore
-LICENSE             export-ignore
+LICENSE.txt         export-ignore

.scaffold/tests/bats/_assert_init.bash

@@ -27,7 +27,7 @@ assert_files_present_common() {
   assert_dir_not_exists ".scaffold"
   assert_file_not_exists ".github/workflows/scaffold-release.yml"
   assert_file_not_exists ".github/workflows/scaffold-test.yml"
-  assert_file_not_exists "LICENSE"
+  assert_file_not_exists "LICENSE.txt"
   assert_file_not_exists "README.dist.md"
   assert_file_not_exists "logo.tmp.png"