Fix toolchain installation.

The filter for platform-tools is platform-tool, in contrast to the folder it
installs.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30483 a1c6a512-1295-4272-9138-f99709370657
diff --git a/android/installToolchain.sh b/android/installToolchain.sh
index 0ff1409..05d3d82 100755
--- a/android/installToolchain.sh
+++ b/android/installToolchain.sh
@@ -80,7 +80,7 @@
 
 if [ -z "$(find $SDK_PATH/platforms -type d -name 'android-*')" ]; then
     echo " * Installing Android platforms..."
-    $SDK_PATH/$ANDROID update sdk --no-ui --filter platform,platform-tools,tool
+    $SDK_PATH/$ANDROID update sdk --no-ui --filter platform,platform-tool,tool
 fi
 
 cat <<EOF