Fix rebinded keys (#4175)

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**Add approved & assigned issue number here:**

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/client/UserSettingModal.ts

@@ -505,22 +505,22 @@ export class UserSettingModal extends BaseModal {
       </h2>
 
       <setting-keybind
-        action="modifierKey"
+        action="buildMenuModifier"
         label=${translateText("user_setting.build_menu_modifier")}
         description=${translateText("user_setting.build_menu_modifier_desc")}
-        .defaultKey=${this.defaultKeybinds.modifierKey}
-        .value=${this.getKeyValue("modifierKey")}
-        .display=${this.getKeyChar("modifierKey")}
+        .defaultKey=${this.defaultKeybinds.buildMenuModifier}
+        .value=${this.getKeyValue("buildMenuModifier")}
+        .display=${this.getKeyChar("buildMenuModifier")}
         @change=${this.handleKeybindChange}
       ></setting-keybind>
 
       <setting-keybind
-        action="altKey"
+        action="emojiMenuModifier"
         label=${translateText("user_setting.emoji_menu_modifier")}
         description=${translateText("user_setting.emoji_menu_modifier_desc")}
-        .defaultKey=${this.defaultKeybinds.altKey}
-        .value=${this.getKeyValue("altKey")}
-        .display=${this.getKeyChar("altKey")}
+        .defaultKey=${this.defaultKeybinds.emojiMenuModifier}
+        .value=${this.getKeyValue("emojiMenuModifier")}
+        .display=${this.getKeyChar("emojiMenuModifier")}
         @change=${this.handleKeybindChange}
       ></setting-keybind>