Remove line length ignores from flake8

These line length ignore rules were added to accommodate `pyre-ignore`
comments. They are no longer needed and are being removed.

Fortunately there was only one line of code that ended up being flagged
for being too long. It's being refactored to account for the (once
again) enforced limit.

Author: dirn

.flake8

@@ -5,19 +5,4 @@ max-line-length = 80
 max-complexity = 18
 per-file-ignores =
     src/awards/settings/dev.py: F405
-    # TODO: Remove these once
-    # https://github.com/facebook/pyre-check/pull/256,
-    # https://github.com/facebook/pyre-check/pull/260,
-    # https://github.com/facebook/pyre-check/pull/261, and
-    # https://github.com/facebook/pyre-check/pull/262 can be used.
-    src/applications/forms.py: B950
-    src/applications/migrations/0003_auto_20200507_0125.py: B950
-    src/applications/models.py: B950
-    src/applications/test_views.py: B950
-    src/awards/urls.py: B950
-    src/homepage/test_views.py: B950
-    src/users/migrations/0001_initial.py: B950
-    src/users/forms.py: B950
-    src/users/models.py: B950
-    src/users/views.py: B950
 select = B,C,E,F,W,T4,B9

src/applications/forms.py

@@ -59,13 +59,10 @@ def clean(self) -> Dict[str, Any]:
                     }
                 )
         elif travel_amount:
-            raise forms.ValidationError(
-                {
-                    "travel_requested": _(
-                        "You must request travel assistance before providing an estimated cost."
-                    )
-                }
+            msg = _(
+                "You must request travel assistance before providing an estimated cost."
             )
+            raise forms.ValidationError({"travel_requested": msg})
 
         return cleaned_data