Remove space before ; delimiter in SCSS if() function (#19384)

Co-authored-by: fisker <lionkay@gmail.com>

changelog_unreleased/scss/19384.md

@@ -0,0 +1,13 @@
+#### Remove space before `;` delimiter in SCSS `if()` function (#19384 by @kovsu)
+
+<!-- prettier-ignore -->
+```scss
+// Input
+$value: if(sass($x): 1 ; else: 2);
+
+// Prettier stable
+$value: if(sass($x): 1 ; else: 2);
+
+// Prettier main
+$value: if(sass($x): 1; else: 2);
+```