Fix light partition (#584)

* Fix light partition

Fixes https://github.com/esphome/issues/issues/365

* Lint

esphome/components/partition/light.py

@@ -33,4 +33,5 @@ def to_code(config):
                                            conf[CONF_TO] - conf[CONF_FROM] + 1))
 
     var = cg.new_Pvariable(config[CONF_OUTPUT_ID], segments)
+    yield cg.register_component(var, config)
     yield light.register_light(var, config)

esphome/components/partition/light_partition.h

@@ -24,7 +24,7 @@ class AddressableSegment {
   int32_t dst_offset_;
 };
 
-class PartitionLightOutput : public light::AddressableLight, public Component {
+class PartitionLightOutput : public light::AddressableLight {
  public:
   explicit PartitionLightOutput(std::vector<AddressableSegment> segments) : segments_(segments) {
     int32_t off = 0;