patch 8.2.1582: the channel log does not show typed text

Problem:    The channel log does not show typed text.
Solution:   Add raw typed text to the log file.
diff --git a/src/os_win32.c b/src/os_win32.c
index 96af443..52573fe 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -2065,6 +2065,13 @@
 	buf[len++] = typeahead[0];
 	mch_memmove(typeahead, typeahead + 1, --typeaheadlen);
     }
+#  ifdef FEAT_JOB_CHANNEL
+    if (len > 0)
+    {
+	buf[len] = NUL;
+	ch_log(NULL, "raw key input: \"%s\"", buf);
+    }
+#  endif
     return len;
 
 #else // FEAT_GUI_MSWIN