patch 8.2.4531: LGTM warnings for condition and buffer size

Problem:    LGTM warnings for condition always true and buffer size too small.
Solution:   Remove the useless condition.  Make the buffer larger. (Goc
            Dundar, closes #9914)
diff --git a/src/charset.c b/src/charset.c
index 836a9f6..657ab85 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -558,7 +558,7 @@
 	charbuf[1] = c ^ 0x40;		// DEL displayed as ^?
 	charbuf[2] = NUL;
     }
-    else if (enc_utf8 && c >= 0x80)
+    else if (enc_utf8)
     {
 	transchar_hex(charbuf, c);
     }