patch 8.1.0125: virtual edit replace with multi-byte fails at end of line

Problem:    Virtual edit replace with multi-byte fails at end of line. (Lukas
            Werling)
Solution:   use ins_char() to add the character. (Christian Brabandt,
            closes #3114)  Rename PCHAR() to PBYTE() to avoid mistakes like
            this.
diff --git a/src/macros.h b/src/macros.h
index fcd1a82..c91b4b6 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -14,9 +14,9 @@
  */
 
 /*
- * PCHAR(lp, c) - put character 'c' at position 'lp'
+ * PBYTE(lp, c) - put byte 'c' at position 'lp'
  */
-#define PCHAR(lp, c) (*(ml_get_buf(curbuf, (lp).lnum, TRUE) + (lp).col) = (c))
+#define PBYTE(lp, c) (*(ml_get_buf(curbuf, (lp).lnum, TRUE) + (lp).col) = (c))
 
 /*
  * Position comparisons