Only stop waveforms actually running in ISR #5308
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The ISR could end up writing a 0 to a GPIO that had previously been stopped, effectively overwriting user writes to those pins. Fix to only actually disable and write when a pin was enabled and times out. Fixes esp8266#5306
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The ISR could end up writing a 0 to a GPIO that had previously been
stopped, effectively overwriting user writes to those pins. Fix to
only actually disable and write when a pin was enabled and times out.
Fixes #5306