fixes #4469 manually: reset width on file inputs

docs/assets/css/bootstrap.css

@@ -1015,6 +1015,7 @@ input[type="checkbox"] {
   cursor: pointer;
 }
 
+input[type="file"],
 input[type="image"],
 input[type="submit"],
 input[type="reset"],

less/forms.less

@@ -140,6 +140,7 @@ input[type="checkbox"] {
 }
 
 // Reset width of input images, buttons, radios, checkboxes
+input[type="file"],
 input[type="image"],
 input[type="submit"],
 input[type="reset"],