fix swiftapi.swift lint

Author: Xiaoshouzi-gh

FirebaseAuth/Tests/Unit/SwiftAPI.swift

@@ -43,8 +43,8 @@ class AuthAPI_hOnlyTests: XCTestCase {
        let _: String = codeSettings.androidMinimumVersion,
        let _: String = codeSettings.dynamicLinkDomain,
        let _: String = codeSettings.linkDomain {}
-       codeSettings.linkDomain = nil
-       codeSettings.linkDomain = ""
+    codeSettings.linkDomain = nil
+    codeSettings.linkDomain = ""
   }
 
   @available(iOS 13, tvOS 13, macOS 10.15, macCatalyst 13, watchOS 7, *)