Fix syntax error

That's what I get for trying to take the web UI seriously.

Author: SnoopJ

src/pip/_internal/commands/install.py

@@ -87,7 +87,7 @@ def add_options(self) -> None:
         self.cmd_opts.add_option(cmdoptions.requirements())
         self.cmd_opts.add_option(cmdoptions.constraints())
         self.cmd_opts.add_option(cmdoptions.build_constraints())
-        self.cmd_opts.add_option(cmdoptions.requirements_from_scripts())main
+        self.cmd_opts.add_option(cmdoptions.requirements_from_scripts())
         self.cmd_opts.add_option(cmdoptions.no_deps())
         self.cmd_opts.add_option(cmdoptions.pre())