[#2185] Remove useless warning in reverse compiler

```
GET     /dummy       controllers.Application.dummy()
GET     /dummy1      controllers.Application.dummy()
```
will not generate warning

```
GET     /dummy       controllers.Application.dummy(foo: String)
GET     /dummy1      controllers.Application.dummy(foo = "bar")
```
will still generate warning

```
GET     /dummy1      controllers.Application.dummy(foo = "bar")
GET     /dummy       controllers.Application.dummy(foo: String)
```
will not generate warning
Merge pull request #2197 from baloo/improvements/2185-reverserouter-warnings

[#2185] Remove useless warning in reverse compiler