Fix panning with middle mouse button on windows 10/11

Without preventDefault, when you try to drag the canvas with middle mouse button on Windows (e.g. in Chrome), the cursor change to a "scroll cursor" and the canvas scrolls endlessly instead of being dragged accurately.

packages/node_modules/@node-red/editor-client/src/js/ui/view.js

@@ -1190,6 +1190,7 @@ RED.view = (function() {
 
         if (d3.event.button === 1) {
             // Middle Click pan
+            d3.event.preventDefault();
             mouse_mode = RED.state.PANNING;
             mouse_position = [d3.event.pageX,d3.event.pageY]
             scroll_position = [chart.scrollLeft(),chart.scrollTop()];