[Fix] Ensure from_cfg of Runner have the same defaults values as its __init__ #1368
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Motivation
When I followed the 15-minute tutorial in MMENGINE to write the configuration file, I found that I was missing the setting of env_cfg, but directly instantiating the Runner does not require setting env_cfg. Ensuring that the default parameters for a runner instantiated from a configuration file and instantiated directly are the same will be less confusing.
Modification
Add default parameters consistent with the Runner class to the env_cfg of the configuration file.