SSH Config HostName is ignored if the key is spelled as "hostname" or "Hostname"

[xhiroga]

Describe the problem:
When using an SSH configuration file, Tabby does not read the HostName directive if it is spelled as hostname (all lowercase) or Hostname (capital "H"). It seems that Tabby only recognizes HostName exactly with the capital "N" and ignores other variations.

To Reproduce:

1. Create or edit your ~/.ssh/config file.
2. Define a host with hostname or Hostname (different cases) instead of HostName.
3. Attempt to connect using Tabby.
4. Tabby does not show the host.

Expected behavior:
Tabby should recognize HostName in any case variation, especially since SSH itself accepts HostName in multiple letter cases.