Fix default post sort setting not applied until settings are saved

[Sparronator9999]

Before this commit, the instance default post sort will not be applied until the user saves (not even changes) their settings at least once. See #501 for a detailed description of the bug. This PR changes the subreddit page to try the instance default setting if no cookie exists (using an existing utility function that appears to already be used everywhere else - perhaps post sort was forgotten when the function was first introduced?)

Fixes #501.

[dave0003]

This fails to compile for me. I think its just missing a semicolon.

error: expected `;`, found keyword `let`
  --> src/subreddit.rs:70:44
   |
70 |     let post_sort = setting(&req, "post_sort")
   |                                               ^ help: add `;` here
71 |     let sort = req.param("sort").unwrap_or_else(|| req.param("id").unwrap_or(post_sort));
   |     --- unexpected token

error: could not compile `redlib` (lib) due to 1 previous error

[Sparronator9999]

This fails to compile for me. I think its just missing a semicolon.

I don't know how this happened (I tested this change before making the PR), but the missing semicolon should be fixed now.

[dave0003]

This fails to compile for me. I think its just missing a semicolon.

I don't know how this happened (I tested this change before making the PR), but the missing semicolon should be fixed now.

Thank you. I can confirm it's merging and compiling now.