Remove tabs from HTML files

From https://google.github.io/styleguide/htmlcssguide.html
"Indentation
Indent by 2 spaces at a time.

Don't use tabs or mix tabs and spaces for indentation."

Tested: Manual regression testing on a Witherspoon.
Change-Id: Ief7137dabc869b73b73f9947337fbb0abb5ca497
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/common/directives/serial-console.html b/app/common/directives/serial-console.html
index 7238f54..cf451aa 100644
--- a/app/common/directives/serial-console.html
+++ b/app/common/directives/serial-console.html
@@ -1,6 +1,6 @@
 <div class="serial-lan__wrapper">
-	<div id="terminal"></div>
-	<div class="serial-lan__actions">
-		<button class="inline btn-pop-out" ng-click="openTerminalWindow()" ng-show="showTabBtn === true">Open in new tab</button>
-	</div>
+  <div id="terminal"></div>
+  <div class="serial-lan__actions">
+    <button class="inline btn-pop-out" ng-click="openTerminalWindow()" ng-show="showTabBtn === true">Open in new tab</button>
+  </div>
 </div>
\ No newline at end of file