patch 9.1.0056: wrong number of trailing spaces inserted after blockwise put

Problem:  Incorrect number of trailing spaces inserted for multibyte
	  characters when pasting a blockwise register in blockwise visual
          mode (VanaIgr)
Solution: Skip over trailing UTF-8 bytes when computing the number of trailing
          spaces (VanaIgr)

When pasting in blockwise visual mode, and the register type is <CTRL-V>, Vim
aligns the text after the replaced area by inserting spaces after pasted
lines that are shorter than the longest line. When a shorter line contains
multibyte characters, each trailing UTF-8 byte's width is counted in addition
to the width of the character itself. Each trailing byte counts as being 4
cells wide (since it would be displayed as <xx>).

closes: #13909

Signed-off-by: VanaIgr <vanaigranov@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 2a654c1..d06e7e9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    56,
+/**/
     55,
 /**/
     54,