deviced: Fix deploying to device

James Westman requested to merge jwestman/gnome-builder:fix-deviced into master

There were a couple bugs preventing the "deploy" action from working. The first was a bug where the load_finish() and deploy_finish() vfuncs in GbpDevicedDeployStrategy weren't overridden; the second was an issue where the deploy code used the host rather than device architecture, which failed when deploying to a device with a different architecture.

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