BUGFIX: Integer validator with trailing chars

[mstruebing]

closes #2080
So - the error should be somewhere else, not in the validator itself as the test is running through.

Edit:
There is a paradox test case, can someone explain this behaviour?

Ok found it, tests are running but doesn't think these are tests, tests-runner think's tests should be one level deeper:

$ yarn jest -- -w 2 --coverage                                                                                                                                                                                                               
$ NODE_ENV=test jest -w 2 --coverage                                                                                                                                                                                                         
No tests found                                                                                                                                                                                                                               
  32 files checked.                                                                                                                                                                                                                          
  roots: /home/maex/projects/contrib/neos-base-distribution/Packages/Application/Neos.Neos.Ui/packages/neos-ui-validators - 32 matches                                                                                                       
  testMatch: ./src/**/?(*.)spec.js - 0 matches                                                                                                                                                                                               
  testPathIgnorePatterns: /node_modules/ - 32 matches\

propbably some issue with: https://github.com/neos/neos-ui/blob/master/packages/jest-preset-neos-ui/jest-preset.json#L18

[mstruebing]

The error was indeed from the IntegerValidator and should be fixed now by this PR @dennisirmscher

[mstruebing]

I'm interpreting the 👍 from @dennisirmscher as a positive review and therefore merge.