Rename "belowtraces" to "between"

Co-authored-by: Mojtaba Samimi <[email protected]>

Author: my-tien

Diff for: src/components/shapes/attributes.js

@@ -110,7 +110,7 @@ module.exports = templatedArray('shape', {
 
     layer: {
         valType: 'enumerated',
-        values: ['below', 'above', 'belowtraces'],
+        values: ['below', 'above', 'between'],
         dflt: 'above',
         editType: 'arraydraw',
         description: 'Specifies whether shapes are drawn below gridlines (*below*), between gridlines and traces (*belowtraces*) or above traces (*above*).'