patch 8.2.0260: several lines of code are duplicated

Problem:    Several lines of code are duplicated.
Solution:   Move duplicated code to a function. (Yegappan Lakshmanan,
            closes #5330)

src/term.c

@@ -6390,3 +6390,34 @@ cterm_color2rgb(int nr, char_u *r, char_u *g, char_u *b, char_u *ansi_idx)
 }
 #endif
 
+/*
+ * Replace K_BS by <BS> and K_DEL by <DEL>
+ */
+    void
+term_replace_bs_del_keycode(char_u *ta_buf, int ta_len, int len)
+{
+    int		i;
+    int		c;
+
+    for (i = ta_len; i < ta_len + len; ++i)
+    {
+	if (ta_buf[i] == CSI && len - i > 2)
+	{
+	    c = TERMCAP2KEY(ta_buf[i + 1], ta_buf[i + 2]);
+	    if (c == K_DEL || c == K_KDEL || c == K_BS)
+	    {
+		mch_memmove(ta_buf + i + 1, ta_buf + i + 3,
+			(size_t)(len - i - 2));
+		if (c == K_DEL || c == K_KDEL)
+		    ta_buf[i] = DEL;
+		else
+		    ta_buf[i] = Ctrl_H;
+		len -= 2;
+	    }
+	}
+	else if (ta_buf[i] == '\r')
+	    ta_buf[i] = '\n';
+	if (has_mbyte)
+	    i += (*mb_ptr2len_len)(ta_buf + i, ta_len + len - i) - 1;
+    }
+}