Fix linux build

Author: dcwhite

src/Interface/Application/scirun5.qrc

@@ -32,9 +32,9 @@
     <file>Resources/copy.png</file>
     <file>Resources/paste.png</file>
     <file>Resources/download.png</file>
-    <file>Resources/cubic.png</file>
-    <file>Resources/euclidean.png</file>
-    <file>Resources/manhattan.png</file>
+    <file>Resources/cubic.PNG</file>
+    <file>Resources/euclidean.PNG</file>
+    <file>Resources/manhattan.PNG</file>
     <file>Resources/timepiece-512.png</file>
     <file>Resources/new/general/folder.png</file>
     <file>Resources/new/general/header-divider.png</file>