Fix non-matching defaults. (#5452) (#5454)

(cherry picked from commit f84a9bf932)

plugins/modules/cloud/profitbricks/profitbricks.py

@@ -37,6 +37,7 @@ options:
       - Public SSH keys allowing access to the virtual machine.
     type: list
     elements: str
+    default: []
   datacenter:
     description:
       - The datacenter to provision this virtual machine.
@@ -73,6 +74,7 @@ options:
       - list of instance ids, currently only used when state='absent' to remove instances.
     type: list
     elements: str
+    default: []
   count:
     description:
       - The number of virtual machines to create.

plugins/modules/cloud/profitbricks/profitbricks_volume.py

@@ -49,7 +49,7 @@ options:
       - Public SSH keys allowing access to the virtual machine.
     type: list
     elements: str
-    required: false
+    default: []
   disk_type:
     description:
       - The disk type of the volume.
@@ -80,7 +80,7 @@ options:
       - list of instance ids, currently only used when state='absent' to remove instances.
     type: list
     elements: str
-    required: false
+    default: []
   subscription_user:
     description:
       - The ProfitBricks username. Overrides the PB_SUBSCRIPTION_ID environment variable.