removed unused tracking config parameter

Author: Konstiman

examples/gsheets/data-config.js

@@ -26,7 +26,6 @@ var data_config = {
 
     content_based: true,
     is_evaluation: true,
-    evaluation_service: ["matomo"],
 
     is_force_areas: true,
     area_force_alpha: 0.03,

examples/project_website/data-config_base.js

@@ -38,7 +38,6 @@ var data_config = {
   show_keywords: true,
 
   is_evaluation: true,
-  evaluation_service: ["matomo"],
 
   use_hypothesis: true,
 

examples/project_website/data-config_pubmed.js

@@ -37,7 +37,6 @@ var data_config = {
 	show_keywords: true,
 
     is_evaluation: true,
-    evaluation_service: ["matomo"],
 
     use_hypothesis: true,
 

examples/viper/js/data-config_openaire.js

@@ -64,7 +64,6 @@ var data_config = {
     },
 
     is_evaluation: true,
-    evaluation_service: ["ga", "matomo"],
 
     use_hypothesis: true,
 

vis/js/default-config.js

@@ -94,8 +94,6 @@ var config = {
     show_loading_screen: false,
     //evaluation mode/events logging
     is_evaluation: false,
-    //which evaluation service to use. can also be an array. currently possible: "log", "matomo" and "ga"
-    evaluation_service: "log",
     //enable logging of mouseover events (use only temporarily as it creates A LOT of logging events)
     enable_mouseover_evaluation: false,
     //whether to embed the okmaps credit