LCFS-1509: Fuels for other use and Export fuels not saving

[areyeslo]

The issue affecting the row to be saved was fixed with this commit. The root cause was the use of a non-existent function name, get_fuel_category_by_name.

Howerver, other issues were affecting the functionality of Other Use and Export fuels:

• When selecting fuel type and there is only one fuel category, then preselect the value. Otherwise, show the values in the dropdown to allow selection.
• When updating the fuel type, the user needs to select the option for Determining Carbon intensity
• When modifying existing rows, quantity field should not be reset to 0

[github-actions]

Frontend Test Results

  1 files  ±0  119 suites  ±0   40s ⏱️ ±0s
411 tests ±0  391 ✅ ±0  20 💤 ±0  0 ❌ ±0 
413 runs  ±0  393 ✅ ±0  20 💤 ±0  0 ❌ ±0 

Results for commit 147a234. ± Comparison against base commit 04035e3.

♻️ This comment has been updated with latest results.

[github-actions]

Backend Test Results

503 tests  ±0   503 ✅ ±0   1m 50s ⏱️ ±0s
  1 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 147a234. ± Comparison against base commit 04035e3.

♻️ This comment has been updated with latest results.

[AlexZorkin]

Looks good 👍