Fix License headers & CI (#168)

Signed-off-by: crueter <swurl@swurl.xyz>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/168
Co-authored-by: crueter <swurl@swurl.xyz>
Co-committed-by: crueter <swurl@swurl.xyz>

.github/workflows/license-header.yml

@@ -12,8 +12,8 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Fetch master branch
-        run: git fetch origin master:master
+      - name: Fetch
+        run: git fetch origin
 
       - name: Make script executable
         run: chmod +x ./.ci/license-header.rb