[PowerPoint] (1.7) Release (#4937)

Author: ElizabethSamuel-MSFT

.openpublishing.publish.config.json

@@ -51,6 +51,7 @@
         "powerpoint-js-1.4",
         "powerpoint-js-1.5",
         "powerpoint-js-1.6",
+        "powerpoint-js-1.7",
         "visio-js-1.1",
         "word-js-preview",
         "word-js-1.1",