Installer: Use right tag for specifying window icon

Changed in IFW 1.4

Task-number: QTCREATORBUG-10010
Task-number: QTCREATORBUG-10243
Change-Id: I17ed5ee7bdf5fdc093351ac0c148eb5395fe699f
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

dist/installer/ifw/config/config-linux.xml.in

@@ -6,7 +6,7 @@
     <Publisher>Qt Project</Publisher>
     <ProductUrl>http://qt-project.org</ProductUrl>
 
-    <Icon>logo.png</Icon>
+    <InstallerWindowIcon>logo.png</InstallerWindowIcon>
     <Watermark>watermark.png</Watermark>
     <UninstallerName>QtCreatorUninstaller</UninstallerName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->

dist/installer/ifw/config/config-mac.xml.in

@@ -6,7 +6,7 @@
     <Publisher>Qt Project</Publisher>
     <ProductUrl>http://qt-project.org</ProductUrl>
 
-    <Icon>logo.png</Icon>
+    <InstallerWindowIcon>logo.png</InstallerWindowIcon>
     <Watermark>watermark.png</Watermark>
     <UninstallerName>Uninstall Qt Creator</UninstallerName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->

dist/installer/ifw/config/config-windows.xml.in

@@ -6,7 +6,7 @@
     <Publisher>Qt Project</Publisher>
     <ProductUrl>http://qt-project.org</ProductUrl>
 
-    <Icon>logo.png</Icon>
+    <InstallerWindowIcon>logo.png</InstallerWindowIcon>
     <Watermark>watermark.png</Watermark>
     <UninstallerName>QtCreatorUninst</UninstallerName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->