style(pdf): increase parallel symbol height to match body text

app/Services/ExamPdfExportService.php

@@ -1889,10 +1889,11 @@ class ExamPdfExportService
             .'.katex .mrel .mord{font-family:inherit !important;}'
             .'.katex .mrel.katex-rel-parallel{'
             .'display:inline-block;'
-            .'line-height:1;'
-            .'letter-spacing:.08em;'
-            .'vertical-align:-.03em;'
-            .'transform:skewX(-18deg);'
+            .'font-size:1.08em;'
+            .'line-height:1.14;'
+            .'letter-spacing:.06em;'
+            .'vertical-align:-.01em;'
+            .'transform:skewX(-16deg) scaleY(1.16);'
             .'transform-origin:center;'
             .'}'
             .'</style>';