Apply suggestions from code review

Co-authored-by: Geoffrey White <40627776+geoffw0@users.noreply.github.com>

Author: MathiasVP

swift/ql/src/qlpack.yml

@@ -4,6 +4,7 @@ groups:
   - swift
   - queries
 suites: codeql-suites
+extractor: swift
 defaultSuiteFile: codeql-suites/swift-code-scanning.qls
 dependencies:
   codeql/swift-all: "*"