patch 8.1.0754: preferred column is lost when setting 'cursorcolumn'

Problem:    Preferred column is lost when setting 'cursorcolumn'.
Solution:   Change option flag to P_RWINONLY. (Takayuki Kurosawa,
            closes #3806)

src/version.c

@@ -795,6 +795,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    754,
 /**/
     753,
 /**/