Bug: Running adc configure for the first time fails because "config file already exists"

[pottekkat]

Current Behavior

Running adc configure for the first time without a configuration file present will create a new file, but it will fail to write to it because it already exists. This is bad user experience:

> adc configure
Config file not found at /Users/navendu/.adc.yaml. Creating...
Please enter the APISIX server address: 
http://127.0.0.1:9180
Please enter the APISIX token: 
token
Failed to configure ADC
Error: Config File "/Users/navendu/.adc.yaml" Already Exists

Exxpected Behavior

Instead, ADC should create a new file and write to it without throwing an error.

Steps to Reproduce

Run adc configure without ~/.adc.yaml already present.

Environment

• ADC version (run adc version): dev - 78affcd