remove unused imports, rectify isort violations

Files got into the branch that violate both PEP-8 guidelines
and isorts. This fixes them.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/git/update.py

@@ -305,9 +305,9 @@ def main():  # noqa: C901
 
         try:
             metadata_pkgbase = metadata['pkgbase']
-        except KeyError as e:
+        except KeyError:
             die_commit('invalid .SRCINFO, does not contain a pkgbase (is the file empty?)',
-                    str(commit.id))
+                       str(commit.id))
         if not re.match(repo_regex, metadata_pkgbase):
             die_commit('invalid pkgbase: {:s}'.format(metadata_pkgbase),
                        str(commit.id))

aurweb/models/user.py

@@ -65,8 +65,6 @@ class User:
 
     def valid_password(self, password: str):
         """ Check authentication against a given password. """
-        from aurweb.db import session
-
         if password is None:
             return False
 

aurweb/routers/html.py

@@ -2,9 +2,8 @@
 decorators in some way; more complex routes should be defined in their
 own modules and imported here. """
 from http import HTTPStatus
-from urllib.parse import unquote
 
-from fastapi import APIRouter, Form, Request, HTTPException
+from fastapi import APIRouter, Form, HTTPException, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 
 from aurweb.templates import make_context, render_template