fix(web): fix fullscreen mode scale calculations (#828)

Author: RRRadicalEdward

web-client/iron-remote-desktop/src/iron-remote-desktop.svelte

@@ -523,15 +523,14 @@
 
     function fullResize() {
         const windowSize = getWindowSize();
-        const wrapperBoundingBox = wrapper.getBoundingClientRect();
 
-        const containerWidth = windowSize.x - wrapperBoundingBox.x;
-        const containerHeight = windowSize.y - wrapperBoundingBox.y;
+        const containerWidth = windowSize.x;
+        const containerHeight = windowSize.y;
 
         let width = canvas.width;
         let height = canvas.height;
 
-        const ratio = Math.max(containerWidth / canvas.width, containerHeight / canvas.height);
+        const ratio = Math.min(containerWidth / canvas.width, containerHeight / canvas.height);
         width = width * ratio;
         height = height * ratio;