Fix: denominator_corrected_rules/v1 invalid result for complex queries (#9)

Closes slok#804

Signed-off-by: Dmitriy S. Sinyavskiy <contact@r3code.ru>

Author: r3code

internal/plugin/slo/contrib/denominator_corrected_rules_v1/plugin.go

@@ -102,7 +102,7 @@ func (p plugin) denominatorCorrectedSLIRecordGenerator(slo model.PromSLO, window
 		sliExprTplFmt = `(
 {{.numeratorCorrectionMetric}}{{.window}}{{.filter}}
 * on()
-%s
+(%s)
 )
 /
 (%s)