Remove unused argument from generate_metadata

Author: sbidoul

src/pip/_internal/operations/build/metadata_legacy.py

@@ -43,7 +43,6 @@ def generate_metadata(
     build_env,  # type: BuildEnvironment
     setup_py_path,  # type: str
     source_dir,  # type: str
-    editable,  # type: bool
     isolated,  # type: bool
     details,  # type: str
 ):

src/pip/_internal/req/req_install.py

@@ -516,7 +516,6 @@ def _generate_metadata(self):
                 build_env=self.build_env,
                 setup_py_path=self.setup_py_path,
                 source_dir=self.unpacked_source_directory,
-                editable=self.editable,
                 isolated=self.isolated,
                 details=self.name or "from {}".format(self.link)
             )