set correct hash even if browser does not implement replaceState

www/code/main.js

@@ -495,7 +495,7 @@ define([
                 }
 
                 // set the hash
-                if (!readOnly) { Cryptpad.setHash(editHash); }
+                if (!readOnly) { Cryptpad.replaceHash(editHash); }
 
                 Cryptpad.getPadTitle(function (err, title) {
                     if (err) {