Fixed eslint checks

[criadoperez]

Corrected format so eslint tests pass.

eslitnt actions was failing:

Run npx eslint --ext .php,.js .
  npx eslint --ext .php,.js .
  shell: /usr/bin/bash -e {0}

/home/runner/work/zoneminder/zoneminder/web/skins/classic/js/skin.js
  305:54  error  Statement inside of curly braces should be on next line                                                        brace-style
  305:55  error  Unexpected space(s) after '{'                                                                                  block-spacing
  305:70  error  Unexpected space(s) before '}'                                                                                 block-spacing
  305:71  error  Closing curly brace should be on the same line as opening curly brace or on the line after the previous block  brace-style

✖ 4 problems (4 errors, 0 warnings)
  4 errors and 0 warnings potentially fixable with the `--fix` option.

Error: Process completed with exit code 1.