fix(ui): avoid double apply css

Author: elianiva

webview-ui/src/preflight.css

@@ -131,15 +131,15 @@ pre {
 	); /* 4 */
 	font-feature-settings: var(--default-mono-font-feature-settings, normal); /* 5 */
 	font-variation-settings: var(--default-mono-font-variation-settings, normal); /* 6 */
-	font-size: calc(1em * var(--roo-font-size-multiplier, 1)); /* 4 */
+	font-size: 1em; /* 4 */
 }
 
 /*
   Add the correct font size in all browsers.
 */
 
 small {
-	font-size: calc(80% * var(--roo-font-size-multiplier, 1));
+	font-size: 80%;
 }
 
 /*
@@ -148,7 +148,7 @@ small {
 
 sub,
 sup {
-	font-size: calc(75% * var(--roo-font-size-multiplier, 1));
+	font-size: 75%;
 	line-height: 0;
 	position: relative;
 	vertical-align: baseline;