Builder::Remote.inspect_builder requires both checks to pass

Previously, if either of the builder or the remote context were in a
bad state, the build would proceed anyway and fail.

lib/kamal/commands/builder/remote.rb

@@ -19,7 +19,7 @@ class Kamal::Commands::Builder::Remote < Kamal::Commands::Builder::Base
 
   def inspect_builder
     combine \
-      combine inspect_buildx, inspect_remote_context,
+      combine(inspect_buildx, inspect_remote_context),
       [ "(echo no compatible builder && exit 1)" ],
       by: "||"
   end