Changes to fix extension in Thunderbird 128

[rstms]

With these fixes to the current master branch I built an XPI that seems to be working properly.

src/wx/api/sieve/SieveAccountsApi.js
API account username property changed from 'realUsername' to 'username'
API account hostname property changed from 'realHostName' to 'hostName'

src/wx/api/sieve/SieveSocketApi.js
remove ChromeUtils.import of Services.jsm
remove global comment for ChromeUtils
add global comment for Services
modify startTLS() method for changed API properties and function calls when initiating STARTTLS

[rstms]

@thsmi , this PR fails to build due to eslint errors/warnings in code I didn't touch. I forked, pulled the master branch and made changes to 2 files. Should I have used a different branch as a starting point?