The Steam helper checked the Frame Limit only when the offered frame
rates changed. With the limit off during a refresh change, turning it
back on left a value the new rate does not offer, and a failed write was
not tried again. It now checks on every state change and every 5 s, and
waits for Steam's settings write so a rejected write is caught and tried
again on the next check.
gamescope 3.16.29-p16 (0120 changed): gamescope took a new host refresh
only from the presentation feedback of a frame it drew, so with nothing
moving on screen it kept the old rate. It now presents once when the
host's wl_output mode changes and keeps presenting while a new rate is
pending, so the 300 ms check runs on a still screen too.
Found by CodeRabbit in the reviews of #1650 and #1663.
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