fix: adjust timeseries grid right offset to match the rest

[diegomedina248]

SUMMARY

Adjust the grid right offset default margin to 20px, the same as the other sides.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

Create any timeseries chart and ensure the padding adjusted to the new base configuration

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

[rusackas]

We should consider using gridUnits for all of our spacings in TIMESERIES_CONSTANTS instead of explicit pixels, but that doesn't make this fix any less valuable for the moment.