fix(gpu): make GPU unavailable if all devices are excluded

[MCozhusheck]

Description

Makes entire GPU unavailable for gpu mining if all devices were excluded.

Motivation and Context

Right now if all devices are excluded the gpu miner will restart over and over failing each time. This PR makes early check for this case.

How Has This Been Tested?

Before mining - turn on GPU mining and turn off every GPU device then:

• check if GPU mining is not working (check GPU power and if xtrgpuminer process is absent)

Also check case if GPU mining is turned on and at least 1 GPU device then check if GPU mining is working as expected.

What process can a PR reviewer use to test or verify this change?

Same as above.

Breaking Changes

• None
• Requires data directory on base node to be deleted
• Requires hard fork
• Other - Please specify

[brianp]

Suggested change

	if self.gpu_devices.len() <= excluded_gpu_devices.len() {
	self.is_available = false;
	} else {
	self.is_available = true;
	}
	self.is_available = !(self.gpu_devices.len() <= excluded_gpu_devices.len())

[brianp]

Suggested change

	if (excludedGpuDevices.length === hardware.length) {
	set({ gpu: { ...getState().gpu, mining: { ...getState().gpu.mining, is_available: false } } });
	} else {
	set({ gpu: { ...getState().gpu, mining: { ...getState().gpu.mining, is_available: true } } });
	}
	set({ gpu: { ...getState().gpu, mining: { ...getState().gpu.mining, is_available: !(excludedGpuDevices.length === hardware.length) } } });