Fix block spacing inconsistencies in the integration test code

Most places have a newline before/after `before{Each,All}`,
`after{Each,All}` and `it` to visually separate the blocks for clarity,
but in a handful of places this wasn't done. This commit removes the
inconsistencies so that the test code is formatted consistently.

test/integration/text_layer_spec.mjs

@@ -117,6 +117,7 @@ describe("Text layer", () => {
             `.page[data-page-number = "1"] .endOfContent`
           );
         });
+
         afterEach(async () => {
           await closePages(pages);
         });
@@ -226,6 +227,7 @@ describe("Text layer", () => {
             `.page[data-page-number = "1"] .endOfContent`
           );
         });
+
         afterEach(async () => {
           await closePages(pages);
         });
@@ -315,6 +317,7 @@ describe("Text layer", () => {
             `.page[data-page-number = "1"] .endOfContent`
           );
         });
+
         afterEach(async () => {
           await closePages(pages);
         });
@@ -456,6 +459,7 @@ describe("Text layer", () => {
           { timeout: 0 }
         );
       });
+
       afterEach(async () => {
         await closeSinglePage(page);
         await browser.close();

test/integration/viewer_spec.mjs

@@ -1358,12 +1358,14 @@ describe("PDF viewer", () => {
 
   describe("Pinch-zoom", () => {
     let pages;
+
     beforeEach(async () => {
       pages = await loadAndWait(
         "tracemonkey.pdf",
         `.page[data-page-number = "1"] .endOfContent`
       );
     });
+
     it("keeps the content under the pinch centre fixed on the screen", async () => {
       await Promise.all(
         pages.map(async ([browserName, page]) => {