Strip parentheses in expressions contexts in error messages

compiler/GHC/Hs/Expr.hs

compiler/typecheck/TcExpr.hs

testsuite/tests/dependent/should_fail/T14066e.stderr

testsuite/tests/deriving/should_fail/drvfail011.stderr

testsuite/tests/indexed-types/should_fail/Overlap11.stderr

...ite/tests/partial-sigs/should_compile/ExprSigLocal.stderr

testsuite/tests/polykinds/KindVType.stderr

testsuite/tests/th/T10279.stderr

testsuite/tests/th/T17380.stderr

testsuite/tests/th/TH_1tuple.stderr

testsuite/tests/typecheck/should_fail/T10619.stderr

testsuite/tests/typecheck/should_fail/T6069.stderr

testsuite/tests/typecheck/should_fail/tcfail009.stderr

testsuite/tests/typecheck/should_fail/tcfail032.stderr

testsuite/tests/typecheck/should_fail/tcfail104.stderr

testsuite/tests/typecheck/should_fail/tcfail208.stderr