fix setting the default value

basically before this commit, the default value was set *before* the
prefix check which means it was set on each line instead of only when
the current var is being parsed (as it should)

src/osuparser.cpp

@@ -90,8 +90,9 @@ inline void toLower(std::string &str) {
     CHECK_VAR(section, name, __VA_ARGS__)
 
 #define VAR_GENERIC_D(section, name, default, ...) \
+    VAR_GENERIC(section, name,\
         ret section.name = default;\
-    VAR_GENERIC(section, name, __VA_ARGS__)
+        __VA_ARGS__)
 
 #define VAR_UINT(section, name) \
     VAR_GENERIC(section, name,\