fix(avatar): adjust svg template for emoji avatar to center content i…

…n the middle

Signed-off-by: Maksim Sukharev <antreesy.web@gmail.com>

lib/Service/AvatarService.php

@@ -171,7 +171,7 @@ private function getAvatarFolder(string $token): ISimpleFolder {
 	private string $svgTemplate = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 		<svg width="512" height="512" version="1.1" viewBox="0 0 500 500" xmlns="http://www.w3.org/2000/svg">
 			<rect width="100%" height="100%" fill="#{fill}"></rect>
-			<text x="50%" y="330" style="font-size:240px;font-family:{font};text-anchor:middle;">{letter}</text>
+			<text x="50%" y="50%" style="font-size:240px;font-family:{font};text-anchor:middle;dominant-baseline:middle;">{letter}</text>
 		</svg>';
 
 	public function getAvatar(Room $room, ?IUser $user, bool $darkTheme = false): ISimpleFile {