AWS Profile loading code looks for wrong key in config

[ZachNo]

Both the config and credentials loading code looks for a section matching self.profile, however the proper formatting has profile as a prefix to the profile name in the config file. (except for default)

reqsign/src/aws/config.rs

Line 239 in dfd0bd6

.section(Some(&self.profile))

https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html#:~:text=Depending%20on%20the,the%20credentials%20file