Fix pre-commit ci

[dominikgeissler]

check for case conflicts.................................................Passed
check for broken symlinks............................(no files to check)Skipped
check yaml...............................................................Passed
detect destroyed symlinks................................................Passed
fix end of files.........................................................Passed
mixed line ending........................................................Passed
trim trailing whitespace.................................................Passed
prettier.................................................................Passed
codespell................................................................Passed
eslint...................................................................Failed
- hook id: eslint
- exit code: 1


/code/src/routes/+page.server.ts
  2:15  error  'PageServerLoad' is defined but never used  @typescript-eslint/no-unused-vars

/code/src/routes/signup-pupil/+page.svelte
  127:3  warning  Unused CSS selector "pre"  css-unused-selector

/code/src/routes/signup-student/+page.svelte
  126:3  warning  Unused CSS selector "pre"  css-unused-selector

✖ 3 problems (1 error, 2 warnings)