test/tint: Fix e2e test generation for vec / mat

Where the intrinsic uses the fixed-dimension form of the types.

Change-Id: I1709382f762fe7394bbd88f428f09b15a1a8a643
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/108642
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Ben Clayton <bclayton@google.com>
diff --git a/test/tint/builtins/gen/var/textureStore/602b5a.wgsl.expected.wgsl b/test/tint/builtins/gen/var/textureStore/602b5a.wgsl.expected.wgsl
index ca22b44..2bd7ed1 100644
--- a/test/tint/builtins/gen/var/textureStore/602b5a.wgsl.expected.wgsl
+++ b/test/tint/builtins/gen/var/textureStore/602b5a.wgsl.expected.wgsl
@@ -2,7 +2,7 @@
 
 fn textureStore_602b5a() {
   var arg_1 = 1u;
-  var arg_2 = vec4<f32>();
+  var arg_2 = vec4<f32>(1.0f);
   textureStore(arg_0, arg_1, arg_2);
 }