Update cpp/ql/test/library-tests/dataflow/external-models/test.cpp

Co-authored-by: Jeroen Ketema <93738568+jketema@users.noreply.github.com>

Author: MathiasVP

cpp/ql/test/library-tests/dataflow/external-models/test.cpp

@@ -45,7 +45,7 @@ using pthread_attr_t = void*;
 
 void *myThreadFunction(void *arg) {
     S* s = (S *)arg;
-		ymlSink(s->x); // $ ir
+    ymlSink(s->x); // $ ir
     return nullptr;
 }