dark themes (MD, iOS): disabled calendar dates not visible

[femto-code]

• Framework7 version: 9.1.0
• Platform and Target: all

Describe the bug

In dark mode (iOS and MD theme affected), disabled calendar dates are not distinguishable from active ones.

In the following screenshot, July 4 is disabled and cannot be clicked but it is not distinguishable from July 1 which is enabled:

The light theme works:

To Reproduce

1. Create calendar instance
2. Set disabled dates
3. Enable dark theme

Expected result

Make disabled dates visually distinguishable from enabled ones, like in dark mode.

Additional

.calendar-day-disabled {
    color: var(--f7-calendar-disabled-text-color);
    cursor: auto;
}

So, --f7-calendar-disabled-text-color needs to be adjusted for the dark theme.