Whitespace recommendations from code review.

Co-authored-by: Matthew Roeschke <[email protected]>

Author: viable-alternative

pandas/_libs/window/aggregations.pyx

@@ -1109,8 +1109,8 @@ def _roll_min_max(
 
         valid_start = -minp
 
-        last_end =0
-        last_start=-1
+        last_end = 0
+        last_start = -1
 
         for i in range(N):
             this_start = start[i]