Update logos on Login screen

[wrdhub]

New logos on login screen to differentiate the apps on login
AC:

• This only applies to the apps, web/desktop login should stay the same.
• In Mail app the new logo and type face are shown on the login screen with correct color per color theme
  • Default light (red) → tuta mail logo with light background
  • Default dark (red) → tuta mail logo with dark background
  • Anything else (custom, dark/light blue) → gray tuta mail logo
• In Calendar app the new logo and type are shown on the login screen with correct color per color theme
  • Default light (blue) → tuta calendar logo with light background
  • Default dark (blue) → tuta calendar logo with dark background
  • Anything else (custom, dark/light red) → gray calendar mail logo

Test Notes

• Calendar App
  • The light/dark red theme has the gray Tuta Calendar logo at home and red/gray Tuta logo in about dialog
  • The light blue theme has the tuta calendar logo with light background (Check Figma) and grey Tuta logo in about dialog
  • The dark blue theme has the tuta calendar logo with dark background (Check Figma) and grey Tuta logo in about dialog
• Mail App
  • The light/dark blue theme has the gray Tuta Mail logo at home and red/gray Tuta logo in about dialog
  • The light red theme has the tuta mail logo with light background (Check Figma) and red Tuta logo in about dialog
  • The dark dark theme has the tuta mail logo with dark background (Check Figma) and grey Tuta logo in about dialog