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)
diff --git a/src/option.c b/src/option.c
index 414e65a..ca3e3d8 100644
--- a/src/option.c
+++ b/src/option.c
@@ -989,7 +989,7 @@
     {"cursorbind",  "crb",  P_BOOL|P_VI_DEF,
 			    (char_u *)VAR_WIN, PV_CRBIND,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
-    {"cursorcolumn", "cuc", P_BOOL|P_VI_DEF|P_RWIN,
+    {"cursorcolumn", "cuc", P_BOOL|P_VI_DEF|P_RWINONLY,
 #ifdef FEAT_SYN_HL
 			    (char_u *)VAR_WIN, PV_CUC,
 #else