Switch two existing pagination error responses to Bad Request

Reviewing the source for cargo, it does not appear that there is any way
to specify a `page` number and the `per_page` value is capped at 100 by
cargo since at least 1.29.  Showing a sub-optimal error message to very
old versions of cargo seems okay.

Author: jtgeibel

src/controllers/helpers/pagination.rs

@@ -1,5 +1,5 @@
 use crate::models::helpers::with_count::*;
-use crate::util::errors::*;
+use crate::util::errors::{bad_request, AppResult};
 use diesel::pg::Pg;
 use diesel::prelude::*;
 use diesel::query_builder::*;
@@ -18,7 +18,7 @@ impl Page {
         if let Some(s) = params.get("page") {
             let numeric_page = s.parse().map_err(|e| bad_request(&e))?;
             if numeric_page < 1 {
-                return Err(cargo_err(&format_args!(
+                return Err(bad_request(&format_args!(
                     "page indexing starts from 1, page {} is invalid",
                     numeric_page,
                 )));
@@ -48,7 +48,7 @@ impl PaginationOptions {
             .unwrap_or(Ok(DEFAULT_PER_PAGE))?;
 
         if per_page > MAX_PER_PAGE {
-            return Err(cargo_err(&format_args!(
+            return Err(bad_request(&format_args!(
                 "cannot request more than {} items",
                 MAX_PER_PAGE,
             )));