test: stop two tests depending on the machine they run on

Both are the same class of defect: a test that reads real machine state and
so passes or fails on circumstance rather than on the code under test.

Item 38. Every MainWindow a test builds constructed its SyncMonitor on the
live /proc/locks, so a window observed the machine's actual sync state and
the sync-button assertion failed whenever the user's cron sync happened to
be running. Cron fires every ten minutes and a run lasts ~35s, which is
roughly 6% of runs, and it read as flakiness. SyncMonitor already took an
injectable locks path for exactly this; MainWindow did not expose it. It
does now, as a test seam rather than a config key: /proc/locks is not
something a user would set, and a wrong value silently disables background
sync detection instead of failing loudly.

The monitor is still constructed and started, per the item's own constraint.
Only the table it reads is redirected, to an empty file in the test's own
temporary directory.

Item 46. uiStateSurvivesARestart asserted a 940px width, and the offscreen
platform reports an 800x800 screen. restoreGeometry() clamps to the
available area, so the width came back as 798 while the 620 height, which
fits, restored untouched. That asymmetry was the tell that persistence was
fine and the test was wrong. The size is now 640x560 and carries no meaning
beyond differing from the default.

Verified by reproducing the original conditions rather than by waiting for
them: the suite run under flock -n /tmp/mbsync.lock fails item 38's
assertion with the seam bypassed and passes with it in place, and item 46
now passes under offscreen where it failed. One dud mutation is recorded in
the backlog, writing an unparseable line into the injected lock table does
not fail the test, because lockHeldIn() correctly finds no lock in it.

Suite: 15/15 offscreen with the lock held, and green on Wayland except the
pre-existing querycompleter screenshot flake, which fails to grab under
Wayland and passes offscreen.

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