Remove useless insertBefore in LESS (#1629)

Remove an `insertBefore` call which was intended to swap the order of `punctuation` and `function`. But as `function` is already before `punctuation` (in [CSS](https://github.com/PrismJS/prism/blob/master/components/prism-css.js#L18)), it doesn't do anything.
PrismJS · Dec 1, 2018 · 86d3179 · 86d3179
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diff --git a/components/prism-less.js b/components/prism-less.js
@@ -34,11 +34,6 @@ Prism.languages.less = Prism.languages.extend('css', {
 	'operator': /[+\-*\/]/
 });
 
-// Invert function and punctuation positions
-Prism.languages.insertBefore('less', 'punctuation', {
-	'function': Prism.languages.less.function
-});
-
 Prism.languages.insertBefore('less', 'property', {
 	'variable': [
 		// Variable declaration (the colon must be consumed!)

diff --git a/components/prism-less.min.js b/components/prism-less.min.js