spliit: address review feedback

- Clear stale backup before creating it, so failed upgrades leave the
  backup in place for recovery
- Drop stray blank line in install script

ct/spliit.sh

@@ -35,6 +35,7 @@ function update_script() {
     msg_ok "Stopped Service"
 
     msg_info "Backing up Configuration"
+    rm -f /opt/spliit.env.bak
     cp /opt/spliit/.env /opt/spliit.env.bak
     msg_ok "Backed up Configuration"
 
@@ -42,7 +43,6 @@ function update_script() {
 
     msg_info "Restoring Configuration"
     cp /opt/spliit.env.bak /opt/spliit/.env
-    rm -f /opt/spliit.env.bak
     msg_ok "Restored Configuration"
 
     msg_info "Building Application"

install/spliit-install.sh

@@ -22,7 +22,6 @@ msg_ok "Installed Dependencies"
 PG_VERSION="16" setup_postgresql
 PG_DB_NAME="spliit" PG_DB_USER="spliit" setup_postgresql_db
 NODE_VERSION="22" setup_nodejs
-
 fetch_and_deploy_gh_release "spliit" "spliit-app/spliit" "tarball"
 
 msg_info "Configuring Application"