fix collapse and modal for IE which do not handle boolean in Object.keys

[Johann-S]

This code is covered that's why there are no unit tests in this PR

Fixes: #26266

/CC @XhmikosR

[XhmikosR]

@Johann-S: I'm still seeing errors with IE10. I can't try IE11 so please try that too.

jQuery.Deferred exception: Object.keys: argument is not an ObjectTypeError: Object.keys: argument is not an Object
   at _objectSpread (http://127.0.0.1:9001/dist/js/bootstrap.js:49:7)
   at _getConfig (http://127.0.0.1:9001/dist/js/bootstrap.js:2983:9)
   at Tooltip (http://127.0.0.1:9001/dist/js/bootstrap.js:2577:9)
   at Anonymous function (http://127.0.0.1:9001/dist/js/bootstrap.js:3060:13)
   at each (https://code.jquery.com/jquery-3.3.1.slim.min.js:2:2755)
   at each (https://code.jquery.com/jquery-3.3.1.slim.min.js:2:1429)
   at _jQueryInterface (http://127.0.0.1:9001/dist/js/bootstrap.js:3050:9)
   at Anonymous function (http://127.0.0.1:9001/assets/js/src/application.js:59:7)
   at each (https://code.jquery.com/jquery-3.3.1.slim.min.js:2:2755)
   at each (https://code.jquery.com/jquery-3.3.1.slim.min.js:2:1429)undefined 
SCRIPT5007: Object.keys: argument is not an Object 
jquery-3.3.1.slim.min.js, line 2 character 31232

[Johann-S]

Before we had that: https://github.com/twbs/bootstrap/blob/v4.0.0/dist/js/bootstrap.js#L31-L47

And now: https://github.com/twbs/bootstrap/blob/v4.1.0/dist/js/bootstrap.js#L46-L63

[XhmikosR]

https://github.com/babel/babel/tree/master/packages/babel-plugin-proposal-object-rest-spread#loose

[Johann-S]

@XhmikosR I fixed unit test in a separate commit, for me it's all good and we should merge this PR.

About extends warning, as you said on Slack we use it like this before so LGTM like that 👍

EDIT:
BTW it's possible to remove loose and avoid extends warning if you prefer 🤔 let me know 😉

[Johann-S]

Ok so it doesn't work on Win 8.1 IE 11 and Win 8 IE 10... And I'm on Win 10 IE 11 but it works...

[Johann-S]

Superseded by: #26291