initSwiper bug fix

[hayden-t]

execution via the eventlistener sends the event object which breaks initSwiper's 'onlyNew' parameter, stopping existing swiper from initialising.

also there was a problem with single = in param check i corrected

[hayden-t]

i just went on a multi hour deep dive into errors thrown in slide nav via left panel even in live demo, and its due to false true of if (param[0] = '{') { fixed in this PR. problem is it corrupts the swiper dataset , so any swiper will need recreating to remove the json that has now been inserted into eg the navigation tag and thus overwrites the internal navigation object casing errors: Uncaught TypeError: can't access property "split", a.disabledClass is undefined

[hayden-t]

im wondering what code puts a json in a data attr ? and also does this code here also need json handling ability ?

VvvebJs/libs/builder/components-elements.js

Lines 1154 to 1160 in 078fe4f

	setTimeout(function () {
	for (i in dataset) {
	element.swiper.params[i] = dataset[i];
	element.dataset[i] = dataset[i];
	};
	element.swiper.update();
	}, 1000);