[Switch Access] Avoid infinite loop when trying to recover

Switch Access' error recovery depends on being able to construct a
desktop node. If a problem occurs during that process, do not try to
recover, as it leads to an infinite loop.

AX-Relnotes: n/a.
Bug: None
Change-Id: I660fe226ffdbf2e9baa2c41e3d63389bce500e31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292698
Reviewed-by: Katie Dektar <katie@chromium.org>
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#787896}