fasthttp: fixed database name in benchmark_config.json: Postgresql -> Postgres

frameworks/Go/fasthttp/benchmark_config.json

@@ -58,7 +58,7 @@
       "port": 8080,
       "approach": "Realistic",
       "classification": "Platform",
-      "database": "Postgresql",
+      "database": "Postgres",
       "framework": "fasthttp",
       "language": "Go",
       "orm": "Raw",
@@ -81,7 +81,7 @@
       "port": 8080,
       "approach": "Realistic",
       "classification": "Platform",
-      "database": "Postgresql",
+      "database": "Postgres",
       "framework": "fasthttp",
       "language": "Go",
       "orm": "Raw",