Fix depends per group in system.xml

[osrecio]

Hide only inputs from fieldset (group) when depends it's leveled for group in system.xml

Description

When you have a <depends> in group the result is that all inputs and groups are hidded, including a depends field.

Fixed Issues (if relevant)

N/A

Manual testing scenarios

1. create a module
2. add system.xml
3. create a group general with field enable yes/no
4. create 2 groups test and test2
5. inside group test add depends to general/enable -> 1
6. go to admin and change value of general->enable

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[vherasymenko]

@osrecio Hi. Could you please add more steps or add your .xml code for reproduce your bug.
I try reproduce issue using your steps and it nothing brings.

[osrecio]

Hi @k7triton ,
I created a Sample Module to test: test-groupsm2 (You can add inside app/code)

Also I recorded my screen with effect:
Before
After