Fix CSS computed property tests broken by app-hiding logic.

tools/tests/apps/modules/eager.css

@@ -1,3 +1,7 @@
 .app-eager-css {
   display: none;
 }
+
+.app-lazy-css {
+  padding: 0;
+}

tools/tests/apps/modules/imports/lazy.css

@@ -1,3 +1,3 @@
 .app-lazy-css {
-  display: none;
+  padding: 10px;
 }

tools/tests/apps/modules/packages/modules-test-package/css/imported.css

@@ -1,3 +1,7 @@
 .pkg-lazy-css.imported {
-  display: none;
+  padding: 20px;
+}
+
+.not-imported {
+  padding: 0px;
 }

tools/tests/apps/modules/packages/modules-test-package/css/not-imported.css

@@ -1,3 +1,3 @@
 .pkg-lazy-css.not-imported {
-  display: none;
+  padding: 20px;
 }

tools/tests/apps/modules/tests.js

@@ -141,28 +141,20 @@ describe("css modules", () => {
   });
 
   it("should be importable by an app", () => {
-    assert.strictEqual(
-      $(".app-lazy-css").css("display"),
-      "block"
-    );
-
+    assert.strictEqual($(".app-lazy-css").css("padding"), "0px");
     require("./imports/lazy.css");
-
-    assert.strictEqual(
-      $(".app-lazy-css").css("display"),
-      "none"
-    );
+    assert.strictEqual($(".app-lazy-css").css("padding"), "10px");
   });
 
   it("should be importable by a package", () => {
     assert.strictEqual(
-      $(".pkg-lazy-css.imported").css("display"),
-      "none"
+      $(".pkg-lazy-css.imported").css("padding"),
+      "20px"
     );
 
     assert.strictEqual(
-      $(".pkg-lazy-css.not-imported").css("display"),
-      "block"
+      $(".pkg-lazy-css.not-imported").css("padding"),
+      "0px"
     );
   });
 });