Preserve Paired Data XPath consistency

[HaidarZ]

update(paired-data): replace 'data' node by 'item' node to preserve pattern and integrate better with pyxform.

Description

We’re used to the following syntax for the calculated fields , checkout the query nodes

count(instance('survey')/root/item[P_Enumerator])	

While just inside Dynamic Data Attachments the rule is changed to use the below

count(instance('survey')/root/data[P_Enumerator])	

One of the use cases is when you try to integrate data pulled from another form into any widget.

Related issues

Checkout the discussion thread on the community forum,

https://community.kobotoolbox.org/t/dynamic-data-attachments-calculation-syntax-enhancement/22580

Note

The following docs must be updated if we elevated the PR.
All the root/data expressions must be replaced by root/item

[jnm]

Pending discussion: https://community.kobotoolbox.org/t/dynamic-data-attachments-calculation-syntax-enhancement/22580/7?u=jnm

[jnm]

I believe the use of data to be consistent with XForm conventions (see discussion also linked above) and therefore decline to merge the change at this time.

I do want to express my gratitude to @HaidarZ for their interest in improving KoBoToolbox. Thank you!