Fix 8 more lints, including last of the "no-unused-vars"

[wincent]

Fixes:

src/components/buttons/button-embed-video-edit.jsx
  120:9   error  'icon' is assigned a value but never used              no-unused-vars

src/plugins/dragresize_ie11.js
    95:8   error  'config' is assigned a value but never used                                                                 no-unused-vars
  1045:4   error  The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype  guard-for-in
  1047:10  error  'dimension' is assigned a value but never used                                                              no-unused-vars
  1050:9   error  'dimension' is not defined                                                                                  no-undef
  1050:22  error  'dimension' is not defined                                                                                  no-undef

src/plugins/tableresize.js
  404:7   error  'destroy' is assigned a value but never used  no-unused-vars

src/plugins/tabletools.js
  803:8  error  'lang' is assigned a value but never used  no-unused-vars

The "dragresize_ie11.js" ones are a bit embarrassing, because I actually caused 4 of those in (f9f3850) ie. #1019. This is why we need QA I guess, because somehow our test suite isn't enough to catch mistakes like this.

Test plan: npm run dev && npm run test && npm run start and check
demo.

Related: #990

[julien]

Just started reviewing :)

Sent from GH.