Revert "Fix package configuration to include Jinja2 template files"

This reverts commit cb4f31f.

Author: malhotra5

openhands/core/pyproject.toml

@@ -20,6 +20,3 @@ build-backend = "setuptools.build_meta"
 where = ["../.."]
 include = ["openhands*"]
 
-[tool.setuptools.package-data]
-"*" = ["*.j2"]
-