Update showAstData to honour blanking of AnnParen

compiler/GHC/Hs/Dump.hs

compiler/GHC/Parser/Annotation.hs

testsuite/tests/ghc-api/exactprint/Test20239.stderr

...ests/haddock/should_compile_flag_haddock/T17544_kw.stderr

testsuite/tests/parser/should_compile/DumpParsedAst.stderr

.../tests/parser/should_compile/DumpParsedAstComments.stderr

testsuite/tests/parser/should_compile/DumpRenamedAst.stderr

testsuite/tests/parser/should_compile/DumpSemis.stderr

testsuite/tests/parser/should_compile/KindSigs.stderr

testsuite/tests/parser/should_compile/T15323.stderr

testsuite/tests/parser/should_compile/T20452.stderr

testsuite/tests/parser/should_compile/T23315/T23315.stderr