Fixed copying empty lines inside selection.

The code was assuming that empty lines have implicit wrap-around attribute.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>

st.c

@@ -949,7 +949,7 @@ getsel(void) {
 		 * st.
 		 * FIXME: Fix the computer world.
 		 */
-		if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
+		if(y < sel.ne.y && !(x > 0 && (gp-1)->mode & ATTR_WRAP))
 			*ptr++ = '\n';
 
 		/*