Put fallthrough in quotes for consistency with other keys

Author: lorenzosim

src/input/keymap.js

@@ -24,7 +24,7 @@ keyMap.pcDefault = {
   "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
   "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
   "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
-  fallthrough: "basic"
+  "fallthrough": "basic"
 }
 // Very basic readline/emacs-style bindings, which are standard on Mac.
 keyMap.emacsy = {
@@ -42,7 +42,7 @@ keyMap.macDefault = {
   "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
   "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
   "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
-  fallthrough: ["basic", "emacsy"]
+  "fallthrough": ["basic", "emacsy"]
 }
 keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault