Specs: fix specs on JRuby 9.2 (2.5 compat)

Author: dmke

spec/influxdb/client_spec.rb

@@ -47,7 +47,7 @@
     it "escapes params" do
       url = subject.send(:full_url, "/unknown", value: ' !@#$%^&*()/\\_+-=?|`~')
       encoded_fragment = "value=+%21%40%23%24%25%5E%26%2A%28%29%2F%5C_%2B-%3D%3F%7C%60"
-      encoded_fragment << (RUBY_ENGINE == "ruby" && RUBY_VERSION >= "2.5.0" ? "~" : "%7E")
+      encoded_fragment << (RUBY_VERSION >= "2.5.0" ? "~" : "%7E")
       expect(url).to include(encoded_fragment)
     end