Folder title shouldn't be converted to all uppercase

[JPJofre]

• VSCode Version: 1.21.1 (1.21.1)
• OS Version: macOS 10.12.6 (16G1212)

In IX/UX and Mac OS, casing is important.
By displaying the folder name all in uppercase in the editor explorer is wrong.

[bpasero]

Closing as designed, we decided to show any view title in uppercase. This is consistent with views across the UI.