C++: Fix query formatting

Author: jketema

cpp/ql/test/library-tests/declarationEntry/declarationEntry/roundTrip.ql

@@ -1,6 +1,7 @@
 import cpp
 
 from DeclarationEntry de, Declaration d, string canRoundTrip
-where d = de.getDeclaration() and
+where
+  d = de.getDeclaration() and
   if d.getADeclarationEntry() = de then canRoundTrip = "yes" else canRoundTrip = "no"
 select de, d, canRoundTrip