Fix minor typo in OS X function key mappings

modules/juce_gui_basics/native/juce_mac_NSViewComponentPeer.mm

@@ -2098,7 +2098,7 @@ const int KeyPress::F7Key           = NSF7FunctionKey;
 const int KeyPress::F8Key           = NSF8FunctionKey;
 const int KeyPress::F9Key           = NSF9FunctionKey;
 const int KeyPress::F10Key          = NSF10FunctionKey;
-const int KeyPress::F11Key          = NSF1FunctionKey;
+const int KeyPress::F11Key          = NSF11FunctionKey;
 const int KeyPress::F12Key          = NSF12FunctionKey;
 const int KeyPress::F13Key          = NSF13FunctionKey;
 const int KeyPress::F14Key          = NSF14FunctionKey;