bug fix, inp_fix_subckt(): problem when parsing a .subckt line

this worked
  .subckt psub a b p2 = {p1*2-1} p1 = 1
but this failed
  .subckt psub a b p2 = { p1 * 2 - 1 }  p1 = 1

thanks to Ivan Riis Nielsen for the report in Message
  [Ngspice-devel] parsing problem (ngspice-24 tarball)

src/frontend/inpcom.c

@@ -1949,8 +1949,9 @@ inp_fix_subckt( char *s )
         head = alloc(struct line);
         /* create list of parameters that need to get sorted */
         while ( *beg && (ptr1 = strstr( beg, "=" )) != NULL ) {
-#ifdef BRACE
-            /* alternative patch to cope with spaces */
+#ifndef NOBRACE
+            /* alternative patch to cope with spaces:
+               get expression between braces {...} */
             ptr2 = ptr1+1;
             ptr1--;
             while ( isspace(*ptr1)  ) ptr1--;