Windows installer: remove unused string

Change-Id: I0a1163b54601932957b0217894173aeadbf34e6e
Reviewed-on: https://gerrit.libreoffice.org/15223Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Andras Timar <andras.timar@collabora.com>

instsetoo_native/inc_openoffice/windows/msi_languages/CustomAc.ulf

@@ -22,8 +22,5 @@ en-US  = "A newer version of [ProductName] was found. To install an older versio
 [OOO_CUSTOMACTION_2]
 en-US  = "The same version of this product is already installed."
 
-[OOO_CUSTOMACTION_3]
-en-US = "An older version of [ProductName] was found. To install a newer version, the older version needs to be removed first."
-
 [OOO_CUSTOMACTION_5]
 en-US = "[ProductName] cannot be installed on this Windows version. [WindowsMinVersionText] or newer is required."