Untabify verilog.y (#3412). No functional change.

src/verilog.y

@@ -5661,7 +5661,7 @@ pexpr<nodep>:  // IEEE: property_expr  (The name pexpr is important as regexps j
 //UNSUP |       /**/           id /**/      id ':' yCOVERPOINT expr iffE bins_or_empty  { }
 //UNSUP //                      // IEEE-2012:
 //UNSUP |       bins_or_empty                           { $$ = $1; }
-//UNSUP	;
+//UNSUP;
 
 //UNSUPiffE<nodep>:  // IEEE: part of cover_point, others
 //UNSUP         /* empty */                             { $$ = nullptr; }