fix(slskd): inline LOCK_FILE variable

install/slskd-install.sh

@@ -47,15 +47,13 @@ if [[ ${soularr,,} =~ ^(y|yes)$ ]]; then
   cat <<EOF >/opt/soularr/run.sh
 #!/usr/bin/env bash
 
-LOCK_FILE="/opt/soularr/.soularr.lock"
-
 if ps aux | grep "[s]oularr.py" >/dev/null; then
   echo "Soularr is already running. Exiting..." >&2
   exit 1
 fi
 
 # Remove stale lock file from previous ungraceful exit
-rm -f "\$LOCK_FILE"
+rm -f "/opt/soularr/.soularr.lock"
 
 source /opt/soularr/venv/bin/activate
 uv run python3 -u /opt/soularr/soularr.py --config-dir /opt/soularr 2>&1