chore(ext/prometheus): remove double variable def

Author: cbrand

ext/opentelemetry-ext-prometheus/src/opentelemetry/ext/prometheus/__init__.py

@@ -163,8 +163,7 @@ def _translate_to_prometheus(self, metric_record: MetricRecord):
         # TODO: Add support for histograms when supported in OT
         elif isinstance(metric_record.instrument, ValueRecorder):
             value = metric_record.aggregator.checkpoint
-            isinstance(metric_record.aggregator, MinMaxSumCountAggregator):
-                value = metric_record.aggregator.checkpoint
+            if isinstance(metric_record.aggregator, MinMaxSumCountAggregator):
                 prometheus_metric = SummaryMetricFamily(
                     name=metric_name,
                     documentation=description,