Consistently put the hidden step before the OS icon

wiki/src/install/mac/usb.mdwn

@@ -6,10 +6,10 @@
 [[!meta stylesheet="inc/stylesheets/steps" rel="stylesheet" title=""]]
 [[!meta stylesheet="inc/stylesheets/mac-usb" rel="stylesheet" title=""]]
 
-<div class="step-image">[[!img install/inc/infography/os-mac.png link="no" alt=""]]</div>
-
 <div class="hidden-step-1"></div>
 
+<div class="step-image">[[!img install/inc/infography/os-mac.png link="no" alt=""]]</div>
+
 <p class="start">Start in macOS.</p>
 
 [[!inline pages="install/inc/steps/install_intermediary_intro.inline" raw="yes" sort="age"]]