Revert "Merge pull request #19844 from stevenspiel/link_to_if_block_helper_addition"

This reverts commit d459b001b43d25053e7982e96eb8383538a6e358, reversing
changes made to 4d4950fae9e2a6970b5f1793aadc56a0b44e28a3.

:sweat:

The block is not supposed to be passed to `link_to`. It's used for a
customized behavior of the `condtion = false` case. The docs
illustrate that like so:

```
<%=
   link_to_if(@current_user.nil?, "Login", { controller: "sessions", action: "new" }) do
     link_to(@current_user.login, { controller: "accounts", action: "show", id: @current_user })
   end
%>
```

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