fix(gui): Fix image checks in image selections (#1573)
fix(gui): Fix image checks in image selections (#1573)

I must have screwed something up during a rebase,
this mends the partition table an windows image checks.

Change-Type: patch
resin-io/resin-etcher,resin-io/etcher,resin-io/herostratus,resin-io/etcher,resin-io/etcher,resin-io/resin-etcher,resin-io/etcher,resin-io/etcher,resin-io/herostratus