Fix the ESC key, and update the VisiCalc demo state file

The old VisiCalc demo state file (state.json) was triggering a spurious (keyboard?) event that would generate a beep and wipe the copyright message; I'm kind of curious what was causing that, but the simplest solution for now is to generate a new state.json.

apps/pc/1981/visicalc/manifest.xml

@@ -17,4 +17,4 @@
 		<file dir="../">README.md</file>
 		<link href="http://www.bricklin.com/history/vclicense.htm">VisiCalc License</link>
 	</disk>
-</manifest>
+</manifest>

modules/pcjs/lib/keyboard.js

@@ -551,7 +551,7 @@ Keyboard.aSoftCodes = {
  * @enum {number}
  */
 Keyboard.aKeyCodes = {};
-Keyboard.aKeyCodes[Keyboard.KEYCODE.ESC   + Keyboard.KEYCODE.ONDOWN] =  Keyboard.SCANCODE.ONE;
+Keyboard.aKeyCodes[Keyboard.KEYCODE.ESC   + Keyboard.KEYCODE.ONDOWN] =  Keyboard.SCANCODE.ESC;
 Keyboard.aKeyCodes[Keyboard.ASCII['1']]   = Keyboard.SCANCODE.ONE;
 Keyboard.aKeyCodes[Keyboard.ASCII['!']]   = Keyboard.SCANCODE.ONE    | (Keyboard.SCANCODE.SHIFT << 8);
 Keyboard.aKeyCodes[Keyboard.ASCII['2']]   = Keyboard.SCANCODE.TWO;