fix #K4113 - OPTIONS=symset:blank in RC file

Any plain text symbol set specified in .nethackrc or NETHACKOPTIONS
didn't get loaded but did set the symset name.

Faulty 'if' logic excluded loading of symbol sets that used the
default handling type of H_UNK.

src/options.c

@@ -4058,9 +4058,9 @@ optfn_symset(
                         load_symset("default", PRIMARYSET);
                     }
 #endif
-                    switch_symbols(gs.symset[PRIMARYSET].name != (char *) 0);
-                    go.opt_need_redraw = go.opt_need_glyph_reset = TRUE;
                 }
+                switch_symbols(gs.symset[PRIMARYSET].name != (char *) 0);
+                go.opt_need_redraw = go.opt_need_glyph_reset = TRUE;
             }
         } else
             return optn_err;