Fixing migration script generation paths

[ryanml]

Testing paths were updated via: #10655

development/generate-migration.sh was not updated to use the new paths and formatting to generate the migration scripts.

Manual testing steps:

• yarn generate:migration n (where the last migration id + 1)
• Ensure migration file and test file are correctly created

[metamaskbot]

Builds ready [6dec5b9]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts

Page Load Metrics (553 ± 36 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	44	65	53	7	3
		domContentLoaded	372	637	551	75	36
		load	374	642	553	75	36
		domInteractive	372	636	551	75	36

[kumavis]

Nice catch