Fix installer config for IFW 2.0

Change-Id: I6edbe34f311863019f6150bf0b2ce6400e836755
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>

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

@@ -8,7 +8,7 @@
 
     <InstallerWindowIcon>logo.png</InstallerWindowIcon>
     <Watermark>watermark.png</Watermark>
-    <UninstallerName>QtCreatorUninstaller</UninstallerName>
+    <MaintenanceToolName>QtCreatorUninstaller</MaintenanceToolName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->
     <TargetDir>@homeDir@/qtcreator-{version}</TargetDir>
     <AdminTargetDir>/opt/qtcreator-{version}</AdminTargetDir>

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

@@ -8,7 +8,7 @@
 
     <InstallerWindowIcon>logo.png</InstallerWindowIcon>
     <Background>background.png</Background>
-    <UninstallerName>Uninstall Qt Creator</UninstallerName>
+    <MaintenanceToolName>Uninstall Qt Creator</MaintenanceToolName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->
     <TargetDir>@homeDir@/Applications/Qt Creator {version}</TargetDir>
     <AllowSpaceInPath>true</AllowSpaceInPath>

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

@@ -8,7 +8,7 @@
 
     <InstallerWindowIcon>logo.png</InstallerWindowIcon>
     <Watermark>watermark.png</Watermark>
-    <UninstallerName>QtCreatorUninst</UninstallerName>
+    <MaintenanceToolName>QtCreatorUninst</MaintenanceToolName>
     <!-- @homeDir@ and @rootDir@ are some of the supported vars -->
     <TargetDir>@rootDir@/Qt/qtcreator-{version}</TargetDir>
 </Installer>