Update setup.py

Author: YunchuWang

setup.py

@@ -413,7 +413,7 @@ def _compile_webhost(webhost_dir: pathlib.Path):
         try:
             subprocess.run(
                 args=["dotnet", "build", "WebJobs.Script.sln", "-o", "bin", 
-                      "/p:TreatWarningsAsErrors=false],
+                      "/p:TreatWarningsAsErrors=false"],
                 check=True,
                 cwd=str(webhost_dir),
                 stdout=sys.stdout,