Ask syweb where the webclient is installed (SYN-443)

[matrixbot]

Ask syweb where the web client is, rather than just presuming it's under .__file__. That way, the debian package can declare that actually it lives in a different place, because debian packaging requires that the javascript lives in /usr/share/javascript/....

(This does first depend on a later release of matrix-angular-sdk; see SYWEB-381)

(Imported from https://matrix.org/jira/browse/SYN-443)

(Reported by @leonerd)

[matrixbot]

Jira watchers: @leonerd

[matrixbot]

Links exported from Jira:

is blocked by SYWEB-381

[hawkowl]

Since we want to get rid of the web client, I don't think this is worth doing.