top: improved that #define PRETENDNOCAP implementation

This development (only) define can be used to turn top
into a simple text program, disabling termcap effects.
But input (at screen bottom) suffers from a line wrap.

So, this commit just makes the input prompt processing
a little more effective by adding one leading newline.

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.c

@@ -752,7 +752,11 @@ static void show_msg (const char *str) {
 static int show_pmt (const char *str) {
    int rc;
 
+#ifdef PRETENDNOCAP
+   PUTT("\n%s%s%.*s %s%s%s"
+#else
    PUTT("%s%s%.*s %s%s%s"
+#endif
       , tg2(0, Msg_row)
       , Curwin->capclr_pmt
       , Screen_cols - 2