hltrailingws: adjust autoclose plugin implementation

Fix unwanted highlighting of whitespace in the new line when inserting
a newline after a bracket (when hltrailingws is on). To fix it, change
the order of operations: insert the new empty line after all other
things, to avoid moving the cursor between lines after that.

runtime/plugins/autoclose/autoclose.lua

@@ -50,11 +50,11 @@ function preInsertNewline(bp)
     for i = 1, #autoNewlinePairs do
         if curRune == charAt(autoNewlinePairs[i], 1) then
             if nextRune == charAt(autoNewlinePairs[i], 2) then
-                bp:InsertNewline()
-                bp:InsertTab()
                 bp.Buf:Insert(-bp.Cursor.Loc, "\n" .. ws)
                 bp:StartOfLine()
                 bp:CursorLeft()
+                bp:InsertNewline()
+                bp:InsertTab()
                 return false
             end
         end