remove unneccessary assignments to [[{,Async}GeneratorStart]]

Author: michaelficarra

spec.html

@@ -48118,7 +48118,6 @@ <h1>
             1. Return CreateIterResultObject(_resultValue_, *true*).
           1. Set the code evaluation state of _genContext_ such that when evaluation is resumed for that execution context, _closure_ will be called with no arguments.
           1. Set _generator_.[[GeneratorContext]] to _genContext_.
-          1. Set _generator_.[[GeneratorState]] to ~suspended-start~.
           1. Return ~unused~.
         </emu-alg>
       </emu-clause>
@@ -48475,7 +48474,6 @@ <h1>
             1. Return *undefined*.
           1. Set the code evaluation state of _genContext_ such that when evaluation is resumed for that execution context, _closure_ will be called with no arguments.
           1. Set _generator_.[[AsyncGeneratorContext]] to _genContext_.
-          1. Set _generator_.[[AsyncGeneratorState]] to ~suspended-start~.
           1. Set _generator_.[[AsyncGeneratorQueue]] to a new empty List.
           1. Return ~unused~.
         </emu-alg>