Compiler: Fix enum field size was not taken into account when implicitly passed to a function.

Imported from Pawn 3.3.3930.

Example:

---

enum tag
{
  member[32]
}

new var[tag];

foo(const string[], size = sizeof(string))
{
    // size returns 1 before fix, 32, after.
}

public plugin_init()
{
    foo(var[member]);
}

---

compiler/libpc300/sc2.c

@@ -2734,7 +2734,7 @@ SC_FUNC symbol *addvariable(const char *name,cell addr,int ident,int vclass,int
    * this special case.
    */
   assert(vclass!=sGLOBAL || (sym=findglb(name))==NULL || (sym->usage & uDEFINE)==0
-         || sym->ident==iFUNCTN && sym==curfunc);
+         || (sym->ident==iFUNCTN && sym==curfunc));
 
   if (ident==iARRAY || ident==iREFARRAY) {
     symbol *parent=NULL,*top;