Fix connection filter on sqls widget

[erikn69]

Each new ajax page could bring new connections
The connections accumulate, and appear in all records, even if no SQL exists with that connection

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Fix a css problem

[erikn69]

I did remove this code because it does nothing, seems like a copy/paste issue

php-debugbar/src/DebugBar/Resources/widgets.js

Lines 402 to 411 in 03dd40a

	onFilterClick: function(el) {
	$(el).toggleClass(csscls('excluded'));
	var excludedLabels = [];
	this.$toolbar.find(csscls('.filter') + csscls('.excluded')).each(function() {
	excludedLabels.push(this.rel);
	});
	this.set('exclude', excludedLabels);
	}