patch 8.1.1046: the "secure" variable is used inconsistently

Problem:    the "secure" variable is used inconsistently. (Justin M. Keyes)
Solution:   Set it to one instead of incrementing.
diff --git a/src/buffer.c b/src/buffer.c
index 158c30a..6cfa41f 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5498,7 +5498,7 @@
 		current_sctx.sc_lnum = 0;
 #endif
 		// Make sure no risky things are executed as a side effect.
-		++secure;
+		secure = 1;
 
 		retval = do_set(s, OPT_MODELINE | OPT_LOCAL | flags);
 
diff --git a/src/option.c b/src/option.c
index f9cbcbd..8149521 100644
--- a/src/option.c
+++ b/src/option.c
@@ -5151,13 +5151,12 @@
 			    // effects in secure mode.  Also when the value was
 			    // set with the P_INSECURE flag and is not
 			    // completely replaced.
-			    if (secure
+			    if ((opt_flags & OPT_MODELINE)
 #ifdef HAVE_SANDBOX
-				    || sandbox != 0
+				  || sandbox != 0
 #endif
-				    || (opt_flags & OPT_MODELINE)
-				    || (!value_is_replaced && (*p & P_INSECURE)))
-				++secure;
+				  || (!value_is_replaced && (*p & P_INSECURE)))
+				secure = 1;
 
 			    // Handle side effects, and set the global value
 			    // for ":set" on local options. Note: when setting
diff --git a/src/version.c b/src/version.c
index 133fd3e..3a195e5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -776,6 +776,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1046,
+/**/
     1045,
 /**/
     1044,