style: format code with Prettier (#17)

This commit fixes the style issues introduced in f6a4d85 according to the output
from Prettier.

Details: None

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

chrome/bar/toolbar.css

@@ -109,14 +109,18 @@ toolbarbutton[open="true"] {
 #PersonalToolbar {
   opacity: 0;
   visibility: collapse;
-  transition: opacity 0.4s ease-in-out, visibility 0s linear 0.3s;
+  transition:
+    opacity 0.4s ease-in-out,
+    visibility 0s linear 0.3s;
 }
 
 /* Show bookmarks toolbar when toolbar is hovered */
 #navigator-toolbox:hover > #PersonalToolbar {
   opacity: 1;
   visibility: visible;
-  transition: opacity 0.4s ease-in-out, visibility 0s linear 0.3s;
+  transition:
+    opacity 0.4s ease-in-out,
+    visibility 0s linear 0.3s;
 }
 
 /* Remove maximum/minimum width restriction of sidebar */

chrome/userChrome.css

@@ -7,4 +7,4 @@
 @import "menu/mainmenu.css";
 @import "menu/extensions-menu.css";
 @import "browser/navigation.css";
-@import "misc/round-items.css";
+@import "misc/round-items.css";