#1037 fix timescale

[rtimms]

Fixes issue in notebooks where slider didn't update. Problem was the timescale in plot (the sliders update ok in notebook when the timescale is seconds). It worked in scripts as that called slider_update rather than plot

Fixes #1037

[codecov]

Codecov Report

Merging #1041 into develop will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1041   +/-   ##
========================================
  Coverage    97.63%   97.63%           
========================================
  Files          237      237           
  Lines        12371    12371           
========================================
  Hits         12078    12078           
  Misses         293      293           

Impacted Files	Coverage Δ
pybamm/plotting/quick_plot.py	100.00% <100.00%> (ø)

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[brosaplanella]

Looks good, thanks Rob! However, I tried it and I still have some lag (less than before) in the notebooks. I wonder if there is still something else going on.

[rtimms]

it updates pretty quickly if you just click a point on the slider rather than slide. we use continuous_update=False, so it shouldn't update until you release the mouse, but it seems that it is...