Introduce new copy icon (#8942)

PSG-110

res/themes/legacy-light/css/_legacy-light.scss

@@ -210,7 +210,7 @@ $event-highlight-bg-color: $yellow-background;
 // event timestamp
 $event-timestamp-color: #acacac;
 
-$copy-button-url: "$(res)/img/feather-customised/clipboard.svg";
+$copy-button-url: "$(res)/img/element-icons/copy.svg";
 
 // e2e
 $e2e-verified-color: #76cfa5; // N.B. *NOT* the same as $accent

res/themes/light/css/_light.scss

@@ -325,7 +325,7 @@ $focus-brightness: 105%;
 
 // Icon URLs
 // ********************
-$copy-button-url: "$(res)/img/feather-customised/clipboard.svg";
+$copy-button-url: "$(res)/img/element-icons/copy.svg";
 // ********************
 
 // Location sharing