fix: double click slq lab table cell

[graceguo-supercat]

SUMMARY

To reproduce this issue:

1. open sql lab, run a simple search: select * from wb_health_population
2. double click any cell in the first column: the highlight spread out to many other cells
3. paste the selected text: it has text in many other columns

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

CI and manual test

[codecov]

Codecov Report

Merging #15400 (e768973) into master (22d23fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #15400   +/-   ##
=======================================
  Coverage   77.23%   77.23%           
=======================================
  Files         975      975           
  Lines       50592    50592           
  Branches     6204     6204           
=======================================
  Hits        39075    39075           
  Misses      11310    11310           
  Partials      207      207           

Flag	Coverage Δ
javascript	71.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...src/components/FilterableTable/FilterableTable.tsx	82.26% <ø> (ø)

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[amitmiran137]

LGTM!