fixed env var reference

Author: petesramek

.github/workflows/promote-branch.yml

@@ -160,7 +160,7 @@ jobs:
           echo "Invalid promotion type ${{ inputs.promotion-type }}"
           exit 1
       - name: 'Validate current branch'
-        if: ${{ (env.isdevelopment-branch == 'false') && (env.is-maintenance-branch == 'false') }}
+        if: ${{ (env.is-development-branch == 'false') && (env.is-maintenance-branch == 'false') }}
         run: |
           echo "Invalid current branch '${{ github.ref_name }}'"
           exit 1