open file keyboard shortcut is now handled by a main menu accelerator

src/ui/src/components/KeyboardControl.js

@@ -19,11 +19,6 @@ const KeyboardControl = ({openFile, mode, setMode, deck, setShowTips}) => {
 
 		const keyHandler = event => {
 			switch(event.key) {
-				case "o":
-					if (!event.metaKey && !event.ctrlKey)
-						return;
-					openFile();
-					break;
 				case "Escape":
 					setShowTips(false);
 					break;