Format KW macro invocations onto separate lines

Agent-Logs-Url: https://github.com/Cpp2Rust/cpp2rust/sessions/45d5e81b-9441-4cf4-acc7-9e4448914947

Co-authored-by: nunoplopes <2998477+nunoplopes@users.noreply.github.com>

Author: Copilot

tests/unit/reserved_keywords.cpp

@@ -33,7 +33,14 @@
   X(final)                                                                     \
   X(gen)                                                                       \
   X(macro)                                                                     \
-  X(override) X(priv) X(unsized) X(yield) X(macro_rules) X(raw) X(safe) X(vec)
+  X(override)                                                                  \
+  X(priv)                                                                      \
+  X(unsized)                                                                   \
+  X(yield)                                                                     \
+  X(macro_rules)                                                               \
+  X(raw)                                                                       \
+  X(safe)                                                                      \
+  X(vec)
 
 // Field declaration
 #define F(n) int n;