[Glitch] Change mobile breakpoint back to old version and allow main column to shrink

Port b5bdc69f7b to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/ui/components/columns_area.jsx

@@ -63,7 +63,7 @@ export default class ColumnsArea extends ImmutablePureComponent {
   };
 
   // Corresponds to (max-width: $no-gap-breakpoint - 1px) in SCSS
-  mediaQuery = 'matchMedia' in window && window.matchMedia('(max-width: 1206px)');
+  mediaQuery = 'matchMedia' in window && window.matchMedia('(max-width: 1174px)');
 
   state = {
     renderComposePanel: !(this.mediaQuery && this.mediaQuery.matches),