refactor: conditionally render patcher release stream for Windows platform

src/screens/Launch.svelte

@@ -1425,10 +1425,12 @@
               onclick={browse_osu_installation}>Browse</Button
             >
           </div>
-
+          {#if $platform === 'windows'}
             <div class="flex flex-col">
               <Label class="text-sm" for="setting-custom-cursor">patcher release stream</Label>
-            <div class="text-muted-foreground text-xs">test different versions of the patcher</div>
+              <div class="text-muted-foreground text-xs">
+                test different versions of the patcher
+              </div>
             </div>
             <div class="flex flex-row w-full">
               <Select.Root
@@ -1478,6 +1480,7 @@
                 </Select.Content>
               </Select.Root>
             </div>
+          {/if}
         </div>
       </div>
     {:else if selectedView === 'login'}