Bazel: Remove unused jetty-servlets dependency

The last usage of jetty-servlets dependency was removed in GWT UI
removal change: I767118ba4a70.

Change-Id: I3a6226336562ffb63e17bb825f9447ada4a396c5

lib/jetty/BUILD

@@ -14,13 +14,6 @@ java_library(
     runtime_deps = [":server"],
 )
 
-java_library(
-    name = "servlets",
-    data = ["//lib:LICENSE-Apache2.0"],
-    visibility = ["//visibility:public"],
-    exports = ["@jetty-servlets//jar"],
-)
-
 java_library(
     name = "server",
     data = ["//lib:LICENSE-Apache2.0"],