CI: .ecrc: remove version

The only thing we define in the config file is "SpacesAftertabs": true
besides the version. Apparently it works fine if the version is
removed, and it avoids an error if the version changed (as it just did
now):

> Version from config file is not the same as the version of the binary
> Binary: 2.7.0, Config 2.6.0

.ecrc

@@ -1,4 +1,3 @@
 {
-  "Version": "2.6.0",
   "SpacesAftertabs": true
 }