ui/DrawableTinting/template-params.xml: Set minSdk=21

Change minSdk for DrawableTinting sample from L to 21.

Change-Id: I00205b527fd7b2d66b368fc86162438b03818e14
diff --git a/ui/DrawableTinting/template-params.xml b/ui/DrawableTinting/template-params.xml
index 5c3bd62..dfc3960 100644
--- a/ui/DrawableTinting/template-params.xml
+++ b/ui/DrawableTinting/template-params.xml
@@ -18,7 +18,7 @@
     <group>UI</group>
     <package>com.example.android.drawabletinting</package>
     <!-- change minSdk if needed-->
-    <minSdk>L</minSdk>
+    <minSdk>21</minSdk>
     <strings>
         <intro>
             <![CDATA[