Update MapStore to use the new REST entry point for attribute update

[offtherailz]

Description

Update MapStore to use the new REST entry point for attribute update, instead of URL double encoded one.

See geosolutions-it/geostore#198 and so georchestra/mapstore2-georchestra#101

NOTE FOR TESTERS: after this fixes are merged geostore and mapstore should be tested to continue working as usual. So please re-test resources thumbnails

• old thumbnails still working
• thumbnail update
• new resources with thumbnail

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information

[ElenaGallo]

@offtherailz the following problems occur with thumbnail and details:

1 - It is impossible add a thumbnail when you save new map/dash/story

How to reproduce

• open new map/dash/story
• open save as
• add thumbnail
• add name
• save

Current Result
A modal window appears with error 405: 'Method not allowed'

2 - It is impossible add a thumbnail when you edit properties of new map/dash/story

How to reproduce

• open new map/dash/story
• save with name
• go home page
• open edit properties
• add thumbnail
• save

Current Result
The thumbnail is not saved on the card

3 - 2 also occur on a map/dash/story that has already been created

4 - It is impossible add details when you edit properties of a map

How to reproduce

• open a map without details
• open edit properties
• add details
• save

Current Result
The details are not saved and the Details button is not displayed

Other useful information

If a map has already the details it is possible modify it