fix: 404 error

Signed-off-by: WaitSpring <me@waitspring.com>

resources/content.media/screen.less

@@ -1,4 +1,5 @@
 @import '../variables-content.less';
+@import 'variables-images.less';
 
 figure[ typeof~='mw:File/Thumb' ],
 figure[ typeof~='mw:File/Frame' ] {

resources/content.media/variables-images.less

@@ -0,0 +1,2 @@
+@background-image-magnify-ltr: url( ../images/magnify-ltr.svg );
+@background-image-magnify-rtl: url( ../images/magnify-rtl.svg );

resources/variables-content.less

@@ -31,6 +31,3 @@
 @block-border: #aaa; /* From resources/libraries/common-print.less */
 @border-thumbborder-screen: 1px solid @base80;
 @border-thumbborder-print: 1pt solid @block-border;
-
-@background-image-magnify-ltr: url(images/magnify-ltr.svg);
-@background-image-magnify-rtl: url(images/magnify-rtl.svg);