Don't force using day period for sparkline when comparing to ensure i…

…t compares correct periods (#20094)

Since we merged #20090 when comparing dates we no longer need to force day periods when comparing date ranges since we're ensuring the correct period is being used in the Sparklines visualisation.

Co-authored-by: sgiehl <stefan@matomo.org>

plugins/CoreVisualizations/Visualizations/Sparkline.php

@@ -37,9 +37,7 @@ public function render()
         $period = Common::getRequestVar('period');
         $date = Common::getRequestVar('date');
 
-        if ($period == 'range'
-            || $this->isComparing()
-        ) {
+        if ($period == 'range') {
             $periodObj = Period\Factory::build($period, $date);
             $_GET['period'] = 'day';
             $_GET['date'] = $periodObj->getRangeString();