Fix some inconsistencies in *-ts-modes

Fix some inconsistencies in *-ts-modes

(c-ts-mode--base-mode): Extract comment-* so that we can separate
between C and C++.
(c-ts-mode, c++-ts-mode): Set comment-* variables.

* lisp/progmodes/css-ts-mode.el (css-ts-mode): Add electric-indent.

* lisp/progmodes/java-ts-mode.el
(java-ts-mode--imenu): Add categories.  Only display categories that
exist in the file.
(java-ts-mode): Add electric-indent.

* lisp/progmodes/json-ts-mode.el
(json-ts-mode): Add electric-indent.

* lisp/progmodes/ts-mode.el
(ts-mode--font-lock-settings): Whitespace cleanup.
(ts-mode): Add electric-indent.