Fix dropdowns in new blocks for m3.6

[Info 3bits]

In moodle 3.6, the course overview and timeline block has a new dropdown that is displayed open by default in Adaptable.

Fix the issue forcing dropdown to be closed by default.

[Pierre-Jean CHANCELLIER]

I noticed the same bug in Adaptable 1.7.1 and Moodle 3.6.1. I fixed it with this CSS simple rule :

.dropdown-menu{display:none;}

[Manoj Solanki]

Thank you for the comment. That helped to fix this quicker. I've just fixed it in a way to make sure the dropdown CSS in Adaptable only applies within the navigation bar.

[Manoj Solanki]

Fix #968.

→ <<cset 86b2980b3f5f>>

[Info 3bits]

fix #968 drop-down style in new blocks

→ <<cset 161af473f46f>>

[Info 3bits]

fix #968 drop-down style in new blocks

→ <<cset 8417ff7b0f42>>