fix a few typos with atlantis.yaml

Author: upodroid

.atlantis.yaml

@@ -17,16 +17,16 @@ workflows:
     plan:
       steps:
         - init:
-            extra_args: ["--backend-config", "atlantis.config"]
+            extra_args: ["-backend-config=atlantis.config"]
         - plan:
-            extra_args: ["-var-file", "atlantis.tfvars"]
+            extra_args: ["-var-file=atlantis.tfvars"]
     apply:
       steps:
         - apply:
-            extra_args: ["-var-file", "atlantis.tfvars"]
+            extra_args: ["-var-file=atlantis.tfvars"]
     import:
       steps:
         - init:
-            extra_args: ["--backend-config", "atlantis.config"]
+            extra_args: ["-backend-config=atlantis.config"]
         - import:
-            extra_args: ["-var-file", "atlantis.tfvars"]
+            extra_args: ["-var-file=atlantis.tfvars"]