Remove useless if in tstrsequence.

st.c

@@ -2444,7 +2444,6 @@ tdectest(char c) {
 
 void
 tstrsequence(uchar c) {
-	if (c & 0x80) {
 	switch (c) {
 	case 0x90:   /* DCS -- Device Control String */
 		c = 'P';
@@ -2459,7 +2458,6 @@ tstrsequence(uchar c) {
 		c = ']';
 		break;
 	}
-	}
 	strreset();
 	strescseq.type = c;
 	term.esc |= ESC_STR;