fix(web): keyboard input not working after launching a session via Firefox (#833)

Author: RRRadicalEdward

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

@@ -603,7 +603,7 @@
                 // canvas first in order to receive paste events.
                 // wasmService.mouseButtonState(state, isDown, false);
                 // Focus `contenteditable` element to receive `on_paste` events
-                screenViewer.focus();
+                canvas.focus();
                 // Finish the focus sequence on Firefox
                 ffCnavasFocused = true;
             } else {