[release] Revert "LICENSE: restore LICENSE"

This is only for the main branch. Release branch needs the full license info.

This reverts commit 50240bf.

Change-Id: Ic2d4cf40d77c1717f9ef28c757d4551f5699d776
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/263200
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>

Author: hyangah