remove 2 unneded clone calls on passage change

devNotes/sugarcube stuff/sugarcube-fc-changes.patch

@@ -344,7 +344,7 @@ index aa5c2f2..15d4221 100644
  			return frag;
  		}
 diff --git a/src/state.js b/src/state.js
-index 5ce7c55..3ae79be 100644
+index 5ce7c55..69a73a3 100644
 --- a/src/state.js
 +++ b/src/state.js
 @@ -104,7 +104,7 @@ var State = (() => { // eslint-disable-line no-unused-vars, no-var
@@ -356,6 +356,26 @@ index 5ce7c55..3ae79be 100644
  		}
  
  		if (_prng !== null) {
+@@ -224,8 +224,8 @@ var State = (() => { // eslint-disable-line no-unused-vars, no-var
+ 	*/
+ 	function momentCreate(title, variables) {
+ 		return {
+-			title     : title == null ? '' : String(title),       // lazy equality for null
+-			variables : variables == null ? {} : clone(variables) // lazy equality for null
++			title     : title == null ? '' : String(title), // lazy equality for null
++			variables : variables == null ? {} : variables   // lazy equality for null
+ 		};
+ 	}
+ 
+@@ -510,7 +510,7 @@ var State = (() => { // eslint-disable-line no-unused-vars, no-var
+ 			return [];
+ 		}
+ 
+-		const delta = [clone(historyArr[0])];
++		const delta = [historyArr[0]];
+ 
+ 		for (let i = 1, iend = historyArr.length; i < iend; ++i) {
+ 			delta.push(Diff.diff(historyArr[i - 1], historyArr[i]));
 diff --git a/src/ui.js b/src/ui.js
 index 44fb8fa..fecf8e8 100644
 --- a/src/ui.js