Fix Eclipse classpaths

[JohanBrorson]

Fix the paths to the websocket libraries in Eclipse .classpath file.

Without this change you'll get the following errors when importing the project in Eclipse:

Project 'client' is missing required library: '/third_party/java/websocket/websocket-common-9.4.8.v20180619.jar'
Project 'client' is missing required library: '/trunk/third_party/java/websocket/websocket-api-9.4.8.v20180619.jar'
Project 'client' is missing required library: '/trunk/third_party/java/websocket/websocket-client-9.4.8.v20180619.jar'

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This change is 

[shs96c]

Good catch. Thank you!