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.

src/buffer.c

@@ -5498,7 +5498,7 @@ chk_modeline(
 		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);
 

src/option.c

@@ -5151,13 +5151,12 @@ do_set(
 			    // 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

src/version.c

@@ -775,6 +775,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1046,
 /**/
     1045,
 /**/