Don' regard 1024px width viewport as mobile

* In IsMobileState.js we treat viewports smaller 1024px as mobile.
* In NcAppContent.vue we treat viewports starting with 1024px as mobile.

This results in weird behaviour with screens that have exactly 1024px
width. E.g., on three-pane apps, NcAppContentList is hidden but the
NcAppDetailsToggle button is not displayed yet.

This commit changes NcAppContent.vue to treat viewports smaller 1024px
as mobile, to be in sync with IsMobileState.js.

Fixes: #3758

Signed-off-by: Jonas <jonas@freesources.org>

src/components/NcAppContent/NcAppContent.vue

@@ -381,15 +381,15 @@ export default {
 			position: sticky;
 			top: var(--header-height);
 
-			@media only screen and (max-width: $breakpoint-mobile) {
+			@media only screen and (width < $breakpoint-mobile) {
 				display: none;
 			}
 		}
 
 		&-details {
 			overflow-y: auto;
 
-			@media only screen and (max-width: $breakpoint-mobile) {
+			@media only screen and (width < $breakpoint-mobile) {
 				min-width: 100%;
 			}
 		}