Fix unsetting of stage preference

Change-Id: I9cbf3cc94b109e9917c46cdd1b38b5f15c04cdf8
Signed-off-by: Edwin Kempin <ekempin@google.com>

src/main/java/com/googlesource/gerrit/plugins/imagare/PutPreference.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/imagare/PutPreference.java b/src/main/java/com/googlesource/gerrit/plugins/imagare/PutPreference.java
index 25a364a..cf81032 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/imagare/PutPreference.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/imagare/PutPreference.java
@@ -117,7 +117,7 @@
       }
     } else {
       if (!stage) {
-        db.unset(PREFERENCE, username, KEY_DEFAULT_PROJECT);
+        db.unset(PREFERENCE, username, KEY_STAGE);
         modified = true;
       }
     }