Disable touch mapper associated with an inactive viewport

If a touch mapper is associated with an inactive viewport, disable it.
We don't need to even try to send events there because the user can't
see them.

Bug: 175053311
Test: atest inputflinger_tests
Change-Id: Ia9910f4401deef749f5ca2a84ebe92396390c53f
diff --git a/include/input/DisplayViewport.h b/include/input/DisplayViewport.h
index b90d57e..5e40ca7 100644
--- a/include/input/DisplayViewport.h
+++ b/include/input/DisplayViewport.h
@@ -119,7 +119,7 @@
         physicalBottom = height;
         deviceWidth = width;
         deviceHeight = height;
-        isActive = false;
+        isActive = true;
         uniqueId.clear();
         physicalPort = std::nullopt;
         type = ViewportType::INTERNAL;