Ensure that there's just 1 "vert.x" platform listed (#4893)

Currently there are 2 platforms listed in the report page:

* vert.x
* vertx

This PR makes sure there's just 1 (normalized to `vert.x`)

frameworks/Java/vertx-web/benchmark_config.json

@@ -12,7 +12,7 @@
       "language": "Java",
       "flavor": "None",
       "orm": "Raw",
-      "platform": "vertx",
+      "platform": "Vert.x",
       "webserver": "None",
       "os": "Linux",
       "database_os": "Linux",
@@ -33,7 +33,7 @@
       "language": "Java",
       "flavor": "None",
       "orm": "Raw",
-      "platform": "vertx",
+      "platform": "Vert.x",
       "webserver": "None",
       "os": "Linux",
       "database_os": "Linux",
@@ -54,7 +54,7 @@
       "language": "Java",
       "flavor": "None",
       "orm": "Raw",
-      "platform": "vertx",
+      "platform": "Vert.x",
       "webserver": "None",
       "os": "Linux",
       "database_os": "Linux",
@@ -75,7 +75,7 @@
       "language": "Java",
       "flavor": "None",
       "orm": "Raw",
-      "platform": "vertx",
+      "platform": "Vert.x",
       "webserver": "None",
       "os": "Linux",
       "database_os": "Linux",