samples: Bump minSdk for TextSwitcher

MinSdk value need to be increment to 7 (from 4) for compatibility
with appcompat-v7 library.

Change-Id: Id09e996165ddead744934c0fed9ba3fa246be35a
diff --git a/ui/views/TextSwitcher/template-params.xml b/ui/views/TextSwitcher/template-params.xml
index f29e2cd..b57e228 100644
--- a/ui/views/TextSwitcher/template-params.xml
+++ b/ui/views/TextSwitcher/template-params.xml
@@ -20,7 +20,7 @@
     <package>com.example.android.textswitcher</package>
 
     <!-- change minSdk if needed-->
-    <minSdk>4</minSdk>
+    <minSdk>7</minSdk>
 
     <strings>
         <intro>