Updating test ql file and applying formatting.

Author: bdrodes

cpp/ql/test/library-tests/string_concat/strconcat.ql

@@ -1,8 +1,10 @@
 import cpp
 import semmle.code.cpp.commons.StringConcatenation
+import semmle.code.cpp.dataflow.new.DataFlow
 
 from StringConcatenation s, Expr op, DataFlow::Node res
-where s.getLocation().getFile().getBaseName() = "concat.cpp"
-and op = s.getAnOperand()
-and res = s.getResultNode()
+where
+  s.getLocation().getFile().getBaseName() = "concat.cpp" and
+  op = s.getAnOperand() and
+  res = s.getResultNode()
 select s, op, res