patch 9.1.2069: Search wrap indicator not shown w/out 'shm-S'

patch 9.1.2069: Search wrap indicator not shown w/out 'shm-S'

Problem:  when shortmess doesn't have 'S', backward search wrap doesn't
          show the "W" before count. forward search works fine but
          backward fails because the position check logic is backwards -
          it checks if cursor < pos instead of using the existing
          wrapped flag.
Solution: Use sia->sa_wrapped flag that searchit() already sets
          correctly (glepnir).

fixes:  #5280
closes: #19138

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>