Simplify cython partition api

Signed-off-by: Adam Li <adam2392@gmail.com>

Author: adam2392

sklearn/tree/_splitter.pyx

@@ -820,7 +820,7 @@ cdef inline int node_split_random(
     """
     cdef const int8_t[:] monotonic_cst = splitter.monotonic_cst
     cdef bint with_monotonic_cst = splitter.with_monotonic_cst
-    
+
     # Draw random splits and pick the best
     cdef intp_t start = splitter.start
     cdef intp_t end = splitter.end