Fix flycheck errors

[p4v4n]

Fix all the errors from flycheck.

This contains a breaking change with the derived mode vars being renamed.

• clojurescript-ts-mode -> clojure-ts-clojurescript-mode
• clojurec-ts-mode -> clojure-ts-clojurec-mode
• clojure-dart-ts-mode -> clojure-ts-clojuredart-mode
• clojure-jank-ts-mode -> clojure-ts-jank-mode

[bbatsov]

Please, reflect this renaming in the changelog.

[kommen]

Note to self: after this is merged I have to update this PR: https://github.com/Fuco1/smartparens/pull/1185