Get rid of dashboard white tint (librenms#18507)

* Get rid of annoying dashboard white tint

Everything on the dashboard looks whiter than it should. This is especially noticeable when using a map with satellite view.

Based on the spacing above/below the opacity line, this seems to be a debugging thing from 10 years ago when the dashboard was initially created.

* Clean up CSS transitions in .gridster class

Removed vendor prefixes for CSS transitions in .gridster class.

---------

Co-authored-by: Tony Murray <[email protected]>

Author: anemo-hypostasis

html/css/styles.css

@@ -1430,14 +1430,6 @@ nav.navbar-sticky-top {
 
 .gridster {
     margin: 0 auto;
-
-    opacity: .8;
-
-    -webkit-transition: opacity .6s;
-    -moz-transition: opacity .6s;
-    -o-transition: opacity .6s;
-    -ms-transition: opacity .6s;
-    transition: opacity .6s;
 }
 
 .gridster .gs-w {