Static text bug fix

[philippjfr]

Fixes #858

[codecov]

Codecov Report

Merging #964 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #964      +/-   ##
==========================================
+ Coverage   85.25%   85.25%   +<.01%     
==========================================
  Files          96       96              
  Lines       10715    10718       +3     
==========================================
+ Hits         9135     9138       +3     
  Misses       1580     1580

Impacted Files	Coverage Δ
panel/tests/widgets/test_input.py	100% <100%> (ø)	⬆️
panel/widgets/input.py	97.93% <100%> (+0.01%)	⬆️

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