Using only-parameters for surveys + other performance issue

[Angamanga]

This PR 1. use ONLY-parameters for surveys and 2. only loads the connected survey when editing a post.

To test:
For filters:

• Select filters->Surveys
• The list should display Surveys
• The request to get the survey should use ONLY parameters
• When selecting a filter, only posts matching the filter should appear
  For adding/editing posts:
• When adding a post, the survey-list should appear as usual, but faster
• When clicking on a survey, there will be a little delay, because the whole survey is then loaded from the API
• When editing a post, only the survey that the post is connected to is loaded from the API

This PR fixes USH-1513 and USH-800

[linear]

USH-1513 Use only parameters for survey in Mobile

[linear]

USH-800 Opening up a post in edit mode takes between 2-4 seconds. Can we improve that?

[ushahidlee]

Nice and clean and works great !