patch 8.1.0055: complete test has wrong order of arguments

Problem:    Complete test has wrong order of arguments. Wrong type for
            sentinel variable.
Solution:   Swap arguments, use VAR_UNKNOWN. (Ozaki Kiichi)
diff --git a/src/mbyte.c b/src/mbyte.c
index 545a40d..0443122 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -4799,7 +4799,7 @@
 
     argv[0].v_type = VAR_NUMBER;
     argv[0].vval.v_number = active ? 1 : 0;
-    argv[1].v_type = VAR_NUMBER;
+    argv[1].v_type = VAR_UNKNOWN;
     (void)call_func_retnr(p_imaf, 1, argv, FALSE);
 }
 
diff --git a/src/testdir/test_ins_complete.vim b/src/testdir/test_ins_complete.vim
index 2b4356e..2cd29b5 100644
--- a/src/testdir/test_ins_complete.vim
+++ b/src/testdir/test_ins_complete.vim
@@ -126,15 +126,15 @@
 
   set completefunc=CompleteFunc
   call feedkeys("i\<C-X>\<C-U>\<Esc>", 'x')
-  call assert_equal(s:args[0], [1, 1])
-  call assert_equal(s:args[1][0], 0)
+  call assert_equal([1, 1], s:args[0])
+  call assert_equal(0, s:args[1][0])
   set completefunc=
 
   let s:args = []
   set omnifunc=CompleteFunc
   call feedkeys("i\<C-X>\<C-O>\<Esc>", 'x')
-  call assert_equal(s:args[0], [1, 1])
-  call assert_equal(s:args[1][0], 0)
+  call assert_equal([1, 1], s:args[0])
+  call assert_equal(0, s:args[1][0])
   set omnifunc=
 
   bwipe!
diff --git a/src/version.c b/src/version.c
index 90ec0e4..8d58649 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    55,
+/**/
     54,
 /**/
     53,