Avoid unnecessary recompiles between debug & test builds

This makes development much quicker when switching back and forth
between compiling with RLS while editing and running tests with
`cargo test`.

lib/src/subtree.c

@@ -18,18 +18,9 @@ typedef struct {
   Length new_end;
 } Edit;
 
-#ifdef TREE_SITTER_TEST
-
-#define TS_MAX_INLINE_TREE_LENGTH 2
-#define TS_MAX_TREE_POOL_SIZE 0
-
-#else
-
 #define TS_MAX_INLINE_TREE_LENGTH UINT8_MAX
 #define TS_MAX_TREE_POOL_SIZE 32
 
-#endif
-
 static const ExternalScannerState empty_state = {.length = 0, .short_data = {0}};
 
 // ExternalScannerState