[networking] Fix `--legacy-server-connect` (#7645)

Bugfix for 227bf1a3

Authored by: bashonly

test/test_networking.py

@@ -1152,7 +1152,7 @@ def test_build_handler_params(self):
             'debug_printtraffic': True,
             'compat_opts': ['no-certifi'],
             'nocheckcertificate': True,
-            'legacy_server_connect': True,
+            'legacyserverconnect': True,
         }) as ydl:
             rh = self.build_handler(ydl)
             assert rh.headers.get('test') == 'testtest'

yt_dlp/YoutubeDL.py

@@ -4097,7 +4097,7 @@ def build_request_director(self, handlers):
                     'verbose': 'debug_printtraffic',
                     'source_address': 'source_address',
                     'timeout': 'socket_timeout',
-                    'legacy_ssl_support': 'legacy_server_connect',
+                    'legacy_ssl_support': 'legacyserverconnect',
                     'enable_file_urls': 'enable_file_urls',
                     'client_cert': {
                         'client_certificate': 'client_certificate',