Remove data dropping as an invalid bucket case

ValueMetric's #dropData function flushes and clears the current bucket
only if the drop time coincides with the end of the bucket. Otherwise,
if the current bucket is a partial bucket, we keep this bucket for
further aggregation so it should not be marked invalid.

Test: bit statsd_test:*
Bug: 145918755
Change-Id: I73bccf8fe9e223bd7927fffe2f1665744ae1b452

cmds/statsd/src/metrics/ValueMetricProducer.cpp

@@ -183,11 +183,9 @@ void ValueMetricProducer::onSlicedConditionMayChangeLocked(bool overallCondition
 
 void ValueMetricProducer::dropDataLocked(const int64_t dropTimeNs) {
     StatsdStats::getInstance().noteBucketDropped(mMetricId);
-    // We are going to flush the data without doing a pull first so we need to invalidte the data.
-    bool pullNeeded = mIsPulled && mCondition == ConditionState::kTrue;
-    if (pullNeeded) {
-        invalidateCurrentBucket();
-    }
+
+    // The current partial bucket is not flushed and does not require a pull,
+    // so the data is still valid.
     flushIfNeededLocked(dropTimeNs);
     clearPastBucketsLocked(dropTimeNs);
 }