Fix `TypeError` in `logging` call

[aphedges]

Without the %d present in the log message string, the call to logger.info() as always throwing a TypeError upon running the server.

I created a short script, logging_bug.py for testing:

import logging
from scienceworld import ScienceWorldEnv
logging.basicConfig(level=logging.INFO)
ScienceWorldEnv()

Here is the output before and after my fix:

$ python logging_bug.py
INFO:py4j.java_gateway:Callback Server Starting
INFO:py4j.java_gateway:Socket listening on ('127.0.0.1', 62918)
--- Logging error ---
Traceback (most recent call last):
  File "/Users/ahedges/.pyenv/versions/3.8.15/lib/python3.8/logging/__init__.py", line 1085, in emit
    msg = self.format(record)
  File "/Users/ahedges/.pyenv/versions/3.8.15/lib/python3.8/logging/__init__.py", line 929, in format
    return fmt.format(record)
  File "/Users/ahedges/.pyenv/versions/3.8.15/lib/python3.8/logging/__init__.py", line 668, in format
    record.message = record.getMessage()
  File "/Users/ahedges/.pyenv/versions/3.8.15/lib/python3.8/logging/__init__.py", line 373, in getMessage
    msg = msg % self.args
TypeError: not all arguments converted during string formatting
Call stack:
  File "logging_bug.py", line 4, in <module>
    ScienceWorldEnv()
  File "/Users/ahedges/projects/personal/ScienceWorld/scienceworld/scienceworld.py", line 51, in __init__
    logger.info("ScienceWorld server running on port", port)
Message: 'ScienceWorld server running on port'
Arguments: (62917,)
$ python logging_bug.py
INFO:py4j.java_gateway:Callback Server Starting
INFO:py4j.java_gateway:Socket listening on ('127.0.0.1', 62936)
INFO:scienceworld.scienceworld:ScienceWorld server running on port 62935

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I also made two other small changes while I was at it.