fix: Making chart update more truthful

[Gwitchr]

SUMMARY

Very small text update

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #19877 (96eb5c8) into master (481ccfe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #19877   +/-   ##
=======================================
  Coverage   66.51%   66.51%           
=======================================
  Files        1714     1715    +1     
  Lines       65027    65075   +48     
  Branches     6711     6726   +15     
=======================================
+ Hits        43250    43284   +34     
- Misses      20070    20079    +9     
- Partials     1707     1712    +5     

Flag	Coverage Δ
javascript	51.25% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
.../components/Header/HeaderActionsDropdown/index.jsx	71.66% <100.00%> (ø)
...tend/src/visualizations/FilterBox/controlPanel.jsx	0.00% <0.00%> (-37.50%)	⬇️
...tend/plugins/plugin-chart-handlebars/src/consts.ts	75.00% <0.00%> (-25.00%)	⬇️
superset-frontend/src/views/store.ts	80.00% <0.00%> (-10.00%)	⬇️
...uperset-frontend/src/utils/getClientErrorObject.ts	63.15% <0.00%> (-8.28%)	⬇️
...nts/ExploreAdditionalActionsMenu/ExploreReport.tsx	50.00% <0.00%> (-7.90%)	⬇️
...-ui-chart-controls/src/components/MetricOption.tsx	90.90% <0.00%> (-3.83%)	⬇️
superset-frontend/src/reports/actions/reports.js	36.36% <0.00%> (-3.04%)	⬇️
...ntend/src/explore/components/ExploreChartPanel.jsx	70.49% <0.00%> (-1.18%)	⬇️
...dashboard/components/SliceHeaderControls/index.tsx	66.25% <0.00%> (-0.42%)	⬇️
... and 43 more

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[rusackas]

This update is because the charts are still being loaded when the toast message fires. This update makes the message more truthful