Context window from configure not being used in agent config.json

[cpacker]

Describe the bug
When you select a non-default context window with memgpt configure, then do memgpt run and create a new agent, the new agent does not use the selected context window size.

To Reproduce

memgpt configure, set context window to 4k:

% memgpt configure                         
? Do you want to enable MemGPT with OpenAI? No
? Do you want to enable MemGPT with Azure? No
? Select default inference endpoint: http://localhost:1234
? Select default embedding endpoint: local
? Select default preset: memgpt_chat
? Select your model's context window (for Mistral 7B models, this is probably 8k / 8192): 4096
? Select default persona: sam_pov
? Select default human: cs_phd
? Select storage backend for archival data: local
Saving config to /Users/loaner/.memgpt/config

memgpt run, create a new agent:

% memgpt run
? Would you like to select an existing agent? No
Creating new agent...
Created new agent agent_33.
Hit enter to begin (will request first MemGPT message)^C
Aborted.

Check the config.json of the new agent:

% cat ~/.memgpt/agents/agent_33/config.json
{
    "name": "agent_33",
    "persona": "sam_pov",
    "human": "cs_phd",
    "model": "local",
    "context_window": 8192,
    "preset": "memgpt_chat",
    "data_sources": [],
    "create_time": "2023-11-12 03:55:23 PM ",
    "data_source": null,
    "agent_config_path": "/Users/loaner/.memgpt/agents/agent_33/config.json"
}%         

context_window is also not present in the base config:

% cat ~/.memgpt/config 
[defaults]
model = local
preset = memgpt_chat
model_endpoint = http://localhost:1234
persona = sam_pov
human = cs_phd

[embedding]
model = local
dim = 384
chunk_size = 300

[archival_storage]
type = local

[client]
anon_clientid = 00000000000000...

Expected behavior

config.json should show 4096, not 8192.

[cpacker]

Bug reported by @TheOnlyWiseJEDI