[Hustle] Allow social shares counter numeral colour to be set independently of the icon colour

The white social shares counter numeral doesn't show up well against a light coloured background (especially a white background). The UI does not allow this value to be changed independently of the share icon (using the custom colours option).

I am using this CSS workaround:

/* Social shares counter
Set Hustle modules individually with .hustle-sshare-module-id-# */
.hustle-shares-counter {
color: #0000 !important;