Added x-small breakpoint for fluid-grid

[Blackbaud-SteveBrush]

No description provided.

[codecov-io]

Codecov Report

Merging #1088 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1088   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         317     317           
  Lines        5980    5983    +3     
  Branches      759     760    +1     
======================================
+ Hits         5980    5983    +3

Impacted Files	Coverage Δ
src/modules/fluid-grid/column.component.ts	100% <100%> (ø)	⬆️

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