Rename flag IS_DOGFOOD to IS_STUDIO.

The flag is only set when building from Android Studio... and is never
used for dogfood.

Test: local
Change-Id: I898d585f4558c2437f0152ef102bea59c351f80b
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 397a38b..3a275ff 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2144,7 +2144,7 @@
                     Object tag = v.getTag();
                     String desc = "Collision while binding workspace item: " + item
                             + ". Collides with " + tag;
-                    if (FeatureFlags.IS_DOGFOOD_BUILD) {
+                    if (FeatureFlags.IS_STUDIO_BUILD) {
                         throw (new RuntimeException(desc));
                     } else {
                         Log.d(TAG, desc);