Fix rebinded keys (#4175)

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Resolves #4174 

## Description:

I have fixed the rebinding of the keys for the build menu modifier and
the emoji menu modifier in the settings so that they actually work.
And cleaned up the code

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tktk1234567

src/core/game/UserSettings.ts

@@ -34,8 +34,8 @@ export function getDefaultKeybinds(isMac: boolean): Record<string, string> {
     moveLeft: "KeyA",
     moveDown: "KeyS",
     moveRight: "KeyD",
-    modifierKey: isMac ? "MetaLeft" : "ControlLeft",
-    altKey: "AltLeft",
+    buildMenuModifier: isMac ? "MetaLeft" : "ControlLeft",
+    emojiMenuModifier: "AltLeft",
     shiftKey: "ShiftLeft",
     resetGfx: "KeyR",
     selectAllWarships: "KeyF",