fix: remove unnecessary divider

[pkdotson]

SUMMARY

This pr removes the divider that is no longer need in the data dropdown menu.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

after

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 #19048 (9adb7b3) into master (1b7d056) will increase coverage by 0.19%.
The diff coverage is 100.00%.

❗ Current head 9adb7b3 differs from pull request most recent head 536c480. Consider uploading reports for the commit 536c480 to get more accurate results

@@            Coverage Diff             @@
##           master   #19048      +/-   ##
==========================================
+ Coverage   66.33%   66.52%   +0.19%     
==========================================
  Files        1641     1641              
  Lines       63476    63476              
  Branches     6444     6444              
==========================================
+ Hits        42106    42229     +123     
+ Misses      19704    19584     -120     
+ Partials     1666     1663       -3     

Flag	Coverage Δ
javascript	51.29% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset-frontend/src/views/components/Menu.tsx	58.97% <100.00%> (+2.56%)	⬆️
superset/db_engine_specs/base.py	89.48% <0.00%> (+0.33%)	⬆️
superset/reports/commands/execute.py	91.51% <0.00%> (+0.36%)	⬆️
superset/views/base_api.py	97.89% <0.00%> (+0.42%)	⬆️
superset/views/core.py	77.47% <0.00%> (+0.44%)	⬆️
superset/connectors/sqla/models.py	90.11% <0.00%> (+0.47%)	⬆️
superset/common/query_object.py	95.67% <0.00%> (+0.54%)	⬆️
superset/views/database/views.py	91.89% <0.00%> (+1.35%)	⬆️
superset/models/core.py	88.91% <0.00%> (+1.44%)	⬆️
...eFilters/FiltersConfigModal/FiltersConfigModal.tsx	64.67% <0.00%> (+1.63%)	⬆️
... and 14 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1b7d056...536c480. Read the comment docs.