patch 8.2.1558: signs test fails

Problem:    Signs test fails.
Solution:   Add missing change to sign.c.
diff --git a/src/sign.c b/src/sign.c
index fb452b3..fd373b5 100644
--- a/src/sign.c
+++ b/src/sign.c
@@ -517,6 +517,7 @@
 		sattr->sat_texthl = syn_id2attr(sp->sn_text_hl);
 	    if (sp->sn_line_hl > 0)
 		sattr->sat_linehl = syn_id2attr(sp->sn_line_hl);
+	    sattr->sat_priority = sign->se_priority;
 
 	    // If there is another sign next with the same priority, may
 	    // combine the text and the line highlighting.
diff --git a/src/version.c b/src/version.c
index 214ee2a..411a889 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1558,
+/**/
     1557,
 /**/
     1556,