`Check Current Spot Price` in configuration form cannot resolve any instance type.

When add/modifying an EC2-Spot-Template with any specified well known instance type (e.g. `m5a.large`) the `Check Current Spot Price` function fails with the following message:

`Could not resolve instance type: m5a.large`
I tested several instance types available in that AWS region all resulting in the same error.
Please find an example screenshot attached.

I investigated the plugins-code and I suspect this line in code to be the reason for the fault. It compares the value of the SDKs enumeration `InstanceType` to the name property of the enumeration entry. I would expect it to compare the given value from the form to the value properties of the `InstanceType` enumeration

The provisioning code correctly interprets the given instant type when creating spot requests.