Fixed: Artists poster view on mobile devices

(cherry picked from commit c0b30a50281c38a103c2f800064d0ec964fae6e0)

Co-authored-by: Mark McDowall <mark@mcdowall.ca>

frontend/src/Artist/Index/Posters/ArtistIndexPosters.tsx

@@ -201,11 +201,15 @@ export default function ArtistIndexPosters(props: ArtistIndexPostersProps) {
 
     if (isSmallScreen) {
       const padding = bodyPaddingSmallScreen - 5;
+      const width = window.innerWidth - padding * 2;
+      const height = window.innerHeight;
 
+      if (width !== size.width || height !== size.height) {
         setSize({
-        width: window.innerWidth - padding * 2,
-        height: window.innerHeight,
+          width,
+          height,
         });
+      }
 
       return;
     }