[IMP] mail: push to talk key display for space key

PURPOSE:

When the push to talk key is the "space" we show an "empty string",
which is very confusing and not very clear.

SPECIFICATION:

We display `Space` string instead of empty space.

Task-2794733

closes odoo/odoo#108573

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/models/user_setting.js

@@ -74,7 +74,7 @@ Model({
         pushToTalkKeyToString() {
             const { shiftKey, ctrlKey, altKey, key } = this.pushToTalkKeyFormat();
             const f = (k, name) => (k ? name : "");
-            return `${f(ctrlKey, "Ctrl + ")}${f(altKey, "Alt + ")}${f(shiftKey, "Shift + ")}${key}`;
+            return `${f(ctrlKey, "Ctrl + ")}${f(altKey, "Alt + ")}${f(shiftKey, "Shift + ")}${key === " " ? "Space" : key}`;
         },
         /**
          * @param {String} audioInputDeviceId