[stable/metallb] Fix helm warnings (#16311)

Fixed helm warnings about `configInline` not being a table (when set).

Signed-off-by: Romeo Dumitrescu <winromulus@users.noreply.github.com>

stable/metallb/Chart.yaml

@@ -1,5 +1,5 @@
 apiVersion: v1
-version: 0.11.1
+version: 0.11.2
 name: metallb
 appVersion: 0.8.1
 description: MetalLB is a load-balancer implementation for bare metal Kubernetes clusters

stable/metallb/values.yaml

@@ -17,7 +17,7 @@ existingConfigMap: metallb-config
 #
 # Refer to https://metallb.universe.tf/configuration/ for
 # available options.
-configInline:
+configInline: {}
 
 rbac:
   # create specifies whether to install and use RBAC rules.