chmod +x for `whitebox_runner`

[brownag]

It was not the plugins that didn't have needed execute permissions, but rather whitebox_runner binary.

• closes #102
• and fix for wbt_runner_path(shell_quote=FALSE)

[codecov-commenter]

Codecov Report

Merging #110 (88e8ff9) into master (060b01a) will decrease coverage by 0.01%. The diff coverage is 0.00%.

:exclamation: Current head 88e8ff9 differs from pull request most recent head 20fad75. Consider uploading reports for the commit 20fad75 to get more accurate results

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@@            Coverage Diff            @@
##           master    #110      +/-   ##
=========================================
- Coverage    8.87%   8.87%   -0.01%     
=========================================
  Files          21      21              
  Lines        8372    8374       +2     
=========================================
  Hits          743     743              
- Misses       7629    7631       +2     

Impacted Files	Coverage Δ
R/wbt.R	56.22% <0.00%> (-0.28%)	:arrow_down:

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