Remove incorrect logic from GetFullyQualifiedName()

I think this logic was originally added with the assumption that any
hostname with a dot in it was an FQDN. I believe this is incorrect. The
hostname is the hostname regardless of included dots, and getting the
FQDN amounts to always querying for the canonical name.

src/libpsl-native/src/getfullyqualifiedname.cpp

@@ -30,11 +30,6 @@ char *GetFullyQualifiedName()
         return NULL;
     }
 
-    if (strchr(computerName, '.') != NULL)
-    {
-        return computerName;
-    }
-
     struct addrinfo hints, *info;
 
     memset(&hints, 0, sizeof hints);