[10.0] [FIX] dropdown menu position

[lmignon]

forward port of #49
This fix is required if alfodoo is used with 'web_sheet_full_width'

[coveralls]

Coverage remained the same at 95.161% when pulling 8b19a4b on 10.0-fix_dropdown_menu_position-lmi into ab5d052 on 10.0.

[codecov-io]

Codecov Report

Merging #50 into 10.0 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             10.0      #50   +/-   ##
=======================================
  Coverage   95.16%   95.16%           
=======================================
  Files           5        5           
  Lines         186      186           
=======================================
  Hits          177      177           
  Misses          9        9

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