Revert "add grammar fix from 3874"

This reverts commit 4820822.

vyper/ast/grammar.lark

@@ -15,7 +15,6 @@ module: ( DOCSTRING
         | event_def
         | function_def
         | immutable_def
-        | transient_def
         | exports_decl
         | _NEWLINE )*
 
@@ -48,13 +47,9 @@ constant_def: (constant_private | constant_with_getter) "=" expr
 immutable: "immutable" "(" type ")"
 immutable_def: NAME ":" immutable
 
-// transient definitions
-transient: "transient" "(" type ")"
-transient_def: NAME ":" transient
-
 variable: NAME ":" type
 // NOTE: Temporary until decorators used
-variable_with_getter: NAME ":" "public" "(" (type | immutable | transient) ")"
+variable_with_getter: NAME ":" "public" "(" (type | immutable) ")"
 variable_def: variable | variable_with_getter
 
 // A decorator "wraps" a method, modifying it's context.