gh-90654: Remove unneeded blank line (#95044)

Author: terryjreedy

Lib/idlelib/NEWS.txt

@@ -29,7 +29,6 @@ What's New in IDLE 3.10.0
 Released on 2021-10-04
 =========================
 
-
 bpo-45193: Make completion boxes appear on Ubuntu again.
 
 bpo-40128: Mostly fix completions on macOS when not using tcl/tk 8.6.11