remove string c-types from classes.struct tests

basis/classes/struct/struct-tests.factor

@@ -219,7 +219,7 @@ UNION-STRUCT: struct-test-float-and-bits
         { type bool }
         { class object }
     }
-} ] [ "struct-test-foo" c-type fields>> ] unit-test
+} ] [ struct-test-foo c-type fields>> ] unit-test
 
 [ {
     T{ struct-slot-spec
@@ -236,7 +236,7 @@ UNION-STRUCT: struct-test-float-and-bits
         { class integer }
         { initial 0 }
     }
-} ] [ "struct-test-float-and-bits" c-type fields>> ] unit-test
+} ] [ struct-test-float-and-bits c-type fields>> ] unit-test
 
 STRUCT: struct-test-equality-1
     { x int } ;