Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: roji

.github/workflows/copilot-setup-steps.yml

@@ -48,4 +48,4 @@ jobs:
         run: ./restore.sh
 
       - name: Export SQL Server connection string for the agent's session
-        run: echo "Test__SqlServer__DefaultConnection=Server=localhost;Database=admin;User=SA;Password=${{ secrets.MSSQL_SA_PASSWORD }};Connect Timeout=60;ConnectRetryCount=0;Trust Server Certificate=true" >> "$GITHUB_ENV"
+        run: echo "Test__SqlServer__DefaultConnection=Server=localhost;Database=master;User=SA;Password=${{ secrets.MSSQL_SA_PASSWORD }};Connect Timeout=60;ConnectRetryCount=0;Trust Server Certificate=true" >> "$GITHUB_ENV"