Fix broken test: eachOf

It appears that these tests fell behind the docs: the current docs use
"in" instead of "of", along with some other subtleties. The directory
itself should probably be renamed to "eachIn", too, but I'm just trying
to get rid of all this red in the tests.

packages/pug/test/eachOf/index.test.js

@@ -35,7 +35,7 @@ describe('Proper Usage', () => {
     const html = pug.renderFile(
       __dirname + '/passing/brackets.pug',
       {
-        users: new Map([['a', 'b'], ['foo', 'bar']])
+        users: { a:'b', foo:'bar' }
       }
     )
     expect(html).toMatchSnapshot();
@@ -44,7 +44,7 @@ describe('Proper Usage', () => {
     const html = pug.renderFile(
       __dirname + '/passing/no-brackets.pug',
       {
-        users: new Map([['a', 'b'], ['foo', 'bar']])
+        users: [ ['a', 'b'], ['foo', 'bar'] ]
       }
     )
     expect(html).toMatchSnapshot();

packages/pug/test/eachOf/passing/brackets.pug

@@ -1,3 +1,3 @@
-each [key, val] of users
+each val, key in users
   li= key
   li= val

packages/pug/test/eachOf/passing/no-brackets.pug

@@ -1,3 +1,3 @@
-each data of users
+each data in users
   li= data[0]
   li= data[1]