Fix debauchee#1531: Revert control key remapping from grave/tilde to …

…zenkaku

It was introduced in the pull request debauchee#1214, and even in the description of the request it had been acknowledged that there is no such key on mac keyboards.

As a consequence, it led to inability to transfer grave and tilde symbols, at least from macOS to Windows on default "ABC" keyboard layout.

Unfortunately, I don't have a JIS keyboard, nor understand how to use it. The only thing I can suggest now is to revert the controversial remapping.

src/lib/platform/OSXKeyState.cpp

@@ -131,8 +131,7 @@ static const KeyEntry    s_controlKeys[] = {
     { kKeyEisuToggle, kVK_JIS_Eisu },
     { kKeyKana, kVK_JIS_Kana },
     { kKeyMuhenkan, s_int5VK },
-    { kKeyHenkan, s_int4VK },
-    { kKeyZenkaku, kVK_ANSI_Grave }
+    { kKeyHenkan, s_int4VK }
 };