Update LICENSE.txt to reflect new paths (mattermost#28241)

* Update LICENSE.txt to reflect new paths

Various paths changed after last year's monorepo transition. Update our
license to reflect these, and simplify to reference all of the public
module (already under the Apache 2.0 license).

* fix apparent typo in AGPL license version

LICENSE.txt

@@ -8,11 +8,11 @@ You are licensed to use compiled versions of the Mattermost platform produced by
 
 You may be licensed to use source code to create compiled versions not produced by Mattermost, Inc. in one of two ways:
 
-1. Under the Free Software Foundation’s GNU AGPL v.3.0, subject to the exceptions outlined in this policy; or
+1. Under the Free Software Foundation’s GNU AGPL v3.0, subject to the exceptions outlined in this policy; or
 2. Under a commercial license available from Mattermost, Inc. by contacting [email protected]
 
-You are licensed to use the source code in Admin Tools and Configuration Files (server/templates/, server/i18n/, model/,
-plugin/, server/boards/, server/playbooks/, webapp/ and all subdirectories thereof) under the Apache License v2.0.
+You are licensed to use the source code in Admin Tools and Configuration Files (server/templates/, server/i18n/,
+server/public/, webapp/ and all subdirectories thereof) under the Apache License v2.0.
 
 We promise that we will not enforce the copyleft provisions in AGPL v3.0 against you if your application (a) does not
 link to the Mattermost Platform directly, but exclusively uses the Mattermost Admin Tools and Configuration Files, and