trial & error fix for dockerfile path in benchmark_config.json (4)

Author: iapicca

frameworks/Dart/dart3/benchmark_config.json

@@ -3,7 +3,7 @@
   "maintainers": ["iapicca"], 
   "tests": [{
     "default": { 
-      "dockerfile": "./dart_native/Dockerfile",
+      "dockerfile": "dart_native/Dockerfile",
       "display_name": "dart3_native",
       "json_url": "/json",
       "plaintext_url": "/plaintext",
@@ -16,7 +16,7 @@
       "database_os": "Linux"
     },
     "aot": {
-      "dockerfile": "./dart_aot/Dockerfile",
+      "dockerfile": "dart_aot/Dockerfile",
       "display_name": "dart3_aot",
       "json_url": "/json",
       "plaintext_url": "/plaintext",
@@ -29,7 +29,7 @@
       "database_os": "Linux"
     },
      "jit": {
-      "dockerfile": "./dart_jit/Dockerfile",
+      "dockerfile": "dart_jit/Dockerfile",
       "display_name": "dart3_jit",
       "json_url": "/json",
       "plaintext_url": "/plaintext",