patch 8.2.2893: multi-byte text in popup title shows up wrong

Problem:    Multi-byte text in popup title shows up wrong.
Solution:   Use the character width instead of the byte length. (Ralf Schandl,
            closes #8267, closes #8264)
diff --git a/src/version.c b/src/version.c
index fb8a7ad..2dedcbf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2893,
+/**/
     2892,
 /**/
     2891,