settings: Remove max-width for table min-widths.

These styles were being added to table cells at narrow widths
that weren't yet at the breakpoint to collapse the settings menu
left sidebar, to make sure those columns would stay wide enough
to be readable.

This commit simplifies the media query by keeping this min-width
for all screen widths above the breakpoint. There doesn't seem
to be a downside to this, since we want to keep those cells
readable at wider widths as well, and at wider widths there's
even more space for the other cells.

web/styles/settings.css

@@ -1846,7 +1846,7 @@ label.preferences-radio-choice-label {
     }
 }
 
-@media (width < 830px) and (width > $md_min) {
+@media (width > $md_min) {
     #attachments-settings .upload-file-name {
         min-width: 10em;
     }