[TimePicker] Fix time position in landscape orientation

[dmtrKovalenko]

This PR closes #1197

[cypress]

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Test summary

50 • 0 • 0 • 0

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Run details

Project	material-ui-pickers
Status	Passed
Commit	365d09b
Started	Aug 4, 2019 8:09 AM
Ended	Aug 4, 2019 8:12 AM
Duration	02:09 💡
OS	Linux Debian - 8.11
Browser	Electron 61

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[codecov]

Codecov Report

Merging #1224 into next will decrease coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##            next    #1224      +/-   ##
=========================================
- Coverage   94.2%   94.13%   -0.07%     
=========================================
  Files         56       56              
  Lines       1414     1415       +1     
  Branches     199      200       +1     
=========================================
  Hits        1332     1332              
- Misses        64       65       +1     
  Partials      18       18

Impacted Files	Coverage Δ
lib/src/TimePicker/TimePickerToolbar.tsx	95.65% <100%> (+0.09%)	⬆️
lib/src/views/Clock/ClockPointer.tsx	92% <0%> (-4%)	⬇️

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