Use = instead of : in application conf

Author: pflooky

docker/data/custom/application.conf

@@ -91,7 +91,7 @@ runtime {
         "spark.memory.storageFraction" = "0.5",
         "spark.memory.offHeap.size" = "1g",
         "spark.sql.shuffle.partitions" = "10",
-        "spark.sql.cbo.enabled": "true",
+        "spark.sql.cbo.enabled" = "true",
         "spark.sql.adaptive.enabled" = "true",
         "spark.sql.cbo.planStats.enabled" = "true",
         "spark.sql.legacy.allowUntypedScalaUDF" = "true",