patch 9.0.1622: filetype name t32 is a bit obscure

Problem:    Filetype name t32 is a bit obscure.
Solution:   Rename t32 to trace32. (Christoph Sax, closes #12512)
diff --git a/src/version.c b/src/version.c
index e5cb446..ddc30c2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1622,
+/**/
     1621,
 /**/
     1620,