production: Fix generating bot static files in production.

For upgrade-zulip-from-git to work, we need to be able to run
update-prod-static on production systems, which means provision code
like this cairosvg logic needs to be there for now.

tools/setup/generate_zulip_bots_static_files.py

@@ -7,11 +7,13 @@ import shutil
 import tempfile
 from typing import List, Optional
 
-import cairosvg
-
 ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 if ZULIP_PATH not in sys.path:
     sys.path.append(ZULIP_PATH)
+from scripts.lib.setup_path import setup_path
+setup_path()
+
+import cairosvg
 
 from zulip_bots.lib import get_bots_directory_path