Format the zoom test the way the gate asks for it

Whitespace only. `cargo fmt --check` is a required step and the FR-DSP-5 test
arrived disagreeing with it — kept as its own commit so it can be skipped
wholesale rather than read for a change that matters.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

core/dr-gpu/tests/zoom_resolution.rs

@@ -77,7 +77,11 @@ fn ctx() -> Option<GpuContext> {
 fn stripes(ctx: &GpuContext) -> DemosaicedImage {
     let data: Vec<u8> = (0..SOURCE * SOURCE)
         .flat_map(|i| {
-            let v = if (i % SOURCE).is_multiple_of(2) { 0u8 } else { 255 };
+            let v = if (i % SOURCE).is_multiple_of(2) {
+                0u8
+            } else {
+                255
+            };
             [v, v, v, 255]
         })
         .collect();