Java: Address review comment. Improve getAnImportedType definition

Author: IdrissRio

java/ql/lib/semmle/code/java/Import.qll

@@ -180,12 +180,7 @@ class ModuleImportDeclaration extends Import {
   }
 
   /** Gets a type that is imported from the module. */
-  RefType getAnImportedType() {
-    exists(Package pkg |
-      pkg = this.getAnImportedPackage() and
-      result.getPackage() = pkg
-    )
-  }
+  RefType getAnImportedType() { result.getPackage() = this.getAnImportedPackage() }
 
   override string toString() { result = "import module " + this.getModuleName() }