fix(commitlint): change scope-case to lower-case

This avoids errors when mixing letters and numbers in the scope.

Change-Id: Icd2151d5b42b02ced0d801691ffb5997f4be2a1e
Signed-off-by: Yann Gautier <yann.gautier@st.com>

.commitlintrc.js

@@ -46,7 +46,7 @@ module.exports = {
         "change-id-exists": [1, "always", "Change-Id:"], /* Warning */
         "signed-off-by-exists": [1, "always", "Signed-off-by:"], /* Warning */
 
-        "scope-case": [2, "always", "kebab-case"], /* Error */
+        "scope-case": [2, "always", "lower-case"], /* Error */
         "scope-enum": [1, "always", scopes] /* Warning */
     },
 };