[gitea] add lint-spell-fix to lint-fix (go-gitea#29111)

Followup to go-gitea#29106, fix this
oversight.

(cherry picked from commit c7a21cb)

Author: silverwind

Makefile

@@ -374,7 +374,7 @@ checks-backend: tidy-check swagger-check fmt-check swagger-validate security-che
 lint: lint-frontend lint-backend lint-spell
 
 .PHONY: lint-fix
-lint-fix: lint-frontend-fix lint-backend-fix
+lint-fix: lint-frontend-fix lint-backend-fix lint-spell-fix
 
 .PHONY: lint-frontend
 lint-frontend: lint-js lint-css