style: group together CODE_REPO and CI_SCRIPTS_* variables

It's a cosmetic change without functional changes.
Grouping together related variables in order to improve readability and
make it easier to update/change CI scripts location.
e.g. for testing purpose on TF staging instance

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: I123ca5b1fee5130578f531c89fda4f5be7a39c62
diff --git a/tf-m-nightly-code-coverage.yaml b/tf-m-nightly-code-coverage.yaml
index b2d07b5..cc0a652 100644
--- a/tf-m-nightly-code-coverage.yaml
+++ b/tf-m-nightly-code-coverage.yaml
@@ -55,6 +55,9 @@
           name: 'CI_SCRIPTS_REPO'
           default: 'https://review.trustedfirmware.org/ci/tf-m-ci-scripts'
       - string:
+          name: 'CI_SCRIPTS_BRANCH'
+          default: 'master'
+      - string:
           name: 'GERRIT_REFSPEC'
           default: 'refs/heads/master'
           description: |
@@ -86,9 +89,6 @@
           name: 'LAVA_URL'
           default: 'https://tf.validation.linaro.org'
       - string:
-          name: 'CI_SCRIPTS_BRANCH'
-          default: 'master'
-      - string:
           name: 'CODE_COVERAGE_EN'
           default: 'TRUE'
       - string: