Change splitter colour when active for android chrome.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37198 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4635 Reordering the tree:

- Branch menu moving in root level: ok
- Leaf to branch: ok


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37199 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e