fix(GUI): escape image path spaces correctly on Windows (#560)
fix(GUI): escape image path spaces correctly on Windows (#560)

The `elevator` module passes its arguments directly to
`child_process.execFile()`, which handles escaping spaces and other
weird issues by default.

Instead of passing a separate argument for every word of the writer
proxy script command, we passed the whole thing at once, which means we
didn't get the escaping features by default.

Change-Type: patch
Changelog-Entry: Fix flashing not starting when an image name contains a space.
Signed-off-by: Juan Cruz Viotti <8493db2a4f45d66df375afe12f7eba59fe1c8d78@gmail.com>
cedricve/etcher,cedricve/etcher,resin-io/resin-etcher,resin-io/herostratus,resin-io/resin-etcher,resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/herostratus,resin-io/etcher,cedricve/etcher,resin-io/etcher