fix: use multi-line literal instead of concatenation

Author: Singond

lib/script.js

@@ -51,8 +51,8 @@ export const config = {
   },
   position: {
     title: 'Panel position',
-    description: 'Position of the panel with script output. '
-        + '(Changes to this value will be applied upon reopening the panel.)',
+    description: 'Position of the panel with script output. \
+    (Changes to this value will be applied upon reopening the panel.)',
     type: 'string',
     default: 'Bottom',
     enum: [