fix: remove select width

[eschutho]

SUMMARY

fixes styling of alert inputs

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before:

after:

TESTING INSTRUCTIONS

open alerts and reports

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #15986 (653a60a) into master (f1b57c0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #15986   +/-   ##
=======================================
  Coverage   77.04%   77.04%           
=======================================
  Files         988      988           
  Lines       52387    52387           
  Branches     6626     6626           
=======================================
  Hits        40364    40364           
  Misses      11799    11799           
  Partials      224      224           

Flag	Coverage Δ
javascript	71.55% <ø> (ø)

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

Impacted Files	Coverage Δ
...frontend/src/views/CRUD/alert/AlertReportModal.tsx	62.88% <ø> (ø)

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