Ensure that composite/non-composite fonts won't get the same hash in PartialEvaluator.preEvaluateFont

To hopefully help prevent any future bugs, make sure that composite/non-composite fonts cannot accidentally get matching `hash`es. Given the differences between those font types, that's very unlikely to be useful or even correct in general.

src/core/evaluator.js

@@ -3622,6 +3622,8 @@ class PartialEvaluator {
       }
 
       if (composite) {
+        hash.update("compositeFont");
+
         const compositeWidths = dict.get("W") || baseDict.get("W");
         if (Array.isArray(compositeWidths)) {
           const widthsBuf = [];