Bash syntax fixes, thanks Tronyx :)

sonarr/root/etc/cont-init.d/98-themepark-sonarr

@@ -1,7 +1,7 @@
 #!/usr/bin/with-contenv bash
 
 echo '---------------------------'
-echo '|__Sonarr theme.park Mod__|'
+echo '|  Sonarr theme.park Mod  |'
 echo '---------------------------'
 
 # Display variables for troubleshooting
@@ -10,20 +10,21 @@ echo -e "Variables set:\\n\
 'TP_THEME'=${TP_THEME}\\n"
 
 # Set default
-if [ ! -n "${TP_DOMAIN}" ]; then
+if [[ -z ${TP_DOMAIN} ]]; then
-  echo "Setting TP_DOMAIN to default (gilbn.github.io)"
+    echo 'No domain set, defaulting to gilbn.github.io'
-  TP_DOMAIN="gilbn.github.io"
+    TP_DOMAIN='gilbn.github.io'
 fi
-if [ ! -n "${TP_THEME}" ]; then
+
-  echo "No theme set, defaulting to organizr-dark"
+if [[ -z ${TP_THEME} ]]; then
-  TP_THEME="organizr-dark"
+    echo 'No theme set, defaulting to organizr-dark'
+    TP_THEME='organizr-dark'
 fi
 
 # Adding stylesheets
-if ! grep -q ${TP_DOMAIN} /app/sonarr/bin/UI/index.html; then
+if ! grep -q "${TP_DOMAIN}" /app/sonarr/bin/UI/index.html; then
     echo '---------------------------'
-  echo '|__Adding the stylesheet__|'
+    echo '|  Adding the stylesheet  |'
     echo '---------------------------'
     sed -i "s/<\/head>/<link rel='stylesheet' href='https:\/\/${TP_DOMAIN}\/theme.park\/CSS\/themes\/sonarr\/${TP_THEME}.css'><\/head> /g" /app/sonarr/bin/UI/index.html
-  echo "Stylesheet set to ${TP_THEME}\\n"
+    printf 'Stylesheet set to %s\n' "${TP_THEME}"
 fi