Agent.stream Overrides Prompt Driver

[collindutter]

• I have read and agree to the contributing guidelines.

Describe the bug
Agent.stream overrides Agent.prompt_driver.stream.

To Reproduce

from griptape.drivers import OpenAiChatPromptDriver
from griptape.structures import Agent

agent = Agent(
    stream=False,
    prompt_driver=OpenAiChatPromptDriver(model="gpt-4o", stream=True),
)

print(agent.tasks[0].prompt_driver.stream)

Expected behavior
More intelligent behavior for merging defaults.