Bug 1340439 followup - Update mochitest expectation after merge of se…

…rvo/servo#15779.

UltraBlame original commit: 2e877886c769b49574a6af5ceeac16ccbc50d4cb

layout/style/test/stylo-failures.md

@@ -638,19 +638,6 @@ value
 64
 ]
 *
-test_bug160403
-.
-html
-:
-servo
-/
-servo
-#
-15004
-[
-2
-]
-*
 test_bug229915
 .
 html
@@ -4585,7 +4572,7 @@ background
 -
 position
 [
-3
+1
 ]
 *
 box
@@ -4742,6 +4729,31 @@ servo
 3
 ]
 *
+test_priority_preservation
+.
+html
+text
+-
+decoration
+:
+not
+serialize
+style
+if
+it
+has
+the
+initial
+value
+servo
+/
+servo
+#
+15790
+[
+6
+]
+*
 Unsupported
 pseudo
 -
@@ -4899,7 +4911,7 @@ test_system_font_serialization
 .
 html
 [
-11
+10
 ]
 *
 test_value_storage