Refactor - simplify popover in input group.

[jkmarx]

• Simplify Popover by initializing variables in partial.

[codecov-io]

Codecov Report

Merging #1800 into develop will increase coverage by 0.91%.
The diff coverage is 80%.

@@             Coverage Diff             @@
##           develop    #1800      +/-   ##
===========================================
+ Coverage    40.47%   41.39%   +0.91%     
===========================================
  Files          391      390       -1     
  Lines        25396    25828     +432     
  Branches      1271     1271              
===========================================
+ Hits         10280    10692     +412     
- Misses       15116    15136      +20

Impacted Files	Coverage Δ
...tool-launch/directives/input-group-help-popover.js	100% <ø> (ø)	⬆️
...ui/source/js/tool-launch/ctrls/input-group-ctrl.js	88.23% <ø> (+1.19%)	⬆️
.../tool-launch/services/file-relationship-service.js	95.19% <ø> (-0.14%)	⬇️
refinery/ui/source/js/file-browser/module.js	100% <ø> (ø)	⬆️
refinery/ui/source/js/file-browser/ctrls/ctrl.js	34.32% <100%> (-0.33%)	⬇️
...source/js/file-browser/directives/assay-filters.js	58.33% <66.66%> (ø)	⬆️
...rce/js/file-browser/services/reset-grid-service.js	91.66% <0%> (-8.34%)	⬇️
...file-browser/ctrls/user-file-browser-files-ctrl.js	21.05% <0%> (-2.48%)	⬇️
refinery/tool_manager/utils.py	84.51% <0%> (-1.8%)	⬇️
refinery/tool_manager/models.py	92.81% <0%> (-0.1%)	⬇️
... and 2 more

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