Revise proximity normalization calc 2, a=chris

diff --git a/src/library/index_bundle_iterators/IntersectIterator.php b/src/library/index_bundle_iterators/IntersectIterator.php
index a48040827..d0692f3db 100644
--- a/src/library/index_bundle_iterators/IntersectIterator.php
+++ b/src/library/index_bundle_iterators/IntersectIterator.php
@@ -231,7 +231,7 @@ class IntersectIterator extends IndexBundleIterator
                     $docs = [];
                 }
             } else {
-                 $docs[$key][self::PROXIMITY] = 1;
+                 $docs[$key][self::PROXIMITY] = 0;
             }
             if ($docs != []) {
                 // proximity is aggregated into score in phrase model