patch 8.2.0044: expression type is used inconsistently

Problem:    Expression type is used inconsistently.
Solution:   Add "ETYPE_IS" and "ETYPE_ISNOT" as separate enum values.  Rename
            "TYPE_" to "ETYPE_" to avoid confusion.
diff --git a/src/version.c b/src/version.c
index 044fe08..103174d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    44,
+/**/
     43,
 /**/
     42,