[Fix #10864] Fix a false positive for Style/SymbolProc

[koic]

Fixes #10864.

This PR fixes a false positive for Style/SymbolProc when using Hash#reject.
The same is true for Haash#select.

{foo: :bar}.reject { p _1 } # `_1` is `:foo`
{foo: :bar}.select { p _1 } # `_1` is `:foo`
{foo: :bar}.detect { p _1 } # `_1` is `[:foo, :bar]`
{foo: :bar}.map { p _1 }    # `_1` is `[:foo, :bar]`

It fixes on_block method because the same issue occurs in normal blocks.

{foo: :bar}.select {|item| item.nil? } #=> no erros.
{foo: :bar}.select(&:nil?)             #=> wrong number of arguments (given 1, expected 0) (ArgumentError)

Style/SymbolProc is already marked as unsafe, but it avoids avoidable issues.

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[bbatsov]

Thanks!