Revert "Fixed indexer with type annotation (dotnet#8850)" (dotnet#8888)

This reverts commit 73b0d1d.

Author: KevinRansom

src/fsharp/pars.fsy

@@ -3756,9 +3756,6 @@ atomicExprQualification:
             mlCompatWarning (FSComp.SR.parsParenFormIsForML()) (lhs parseState) 
             mkSynDotParenGet lhsm dotm e $2) }
 
-  |   LBRACK  typedSeqExpr RBRACK
-      { (fun e lhsm dotm -> mkSynDotBrackGet lhsm dotm e $2 false) }
-
   |   LBRACK  typedSeqExpr recover
       { reportParseErrorAt (rhs parseState 1) (FSComp.SR.parsUnmatchedBracket()) 
         (fun e lhsm dotm -> exprFromParseError (mkSynDotBrackGet lhsm dotm e $2 false)) }

tests/fsharp/Compiler/Regressions/IndexerRegressionTests.fs

@@ -71,7 +71,6 @@
     <Compile Include="Compiler\Language\SpanTests.fs" />
     <Compile Include="Compiler\Language\StringConcatOptimizationTests.fs" />
     <Compile Include="Compiler\Stress\LargeExprTests.fs" />
-    <Compile Include="Compiler\Regressions\IndexerRegressionTests.fs" />
     <Compile Include="Compiler\Regressions\ForInDoMutableRegressionTest.fs" />
     <None Include="app.config" />
     <None Include="update.base.line.with.actuals.fsx" />