Updated PapaParse config to prevent CSV injection.

I've updated the PapaParse JS library to the latest version from the master branch which supports the `escapeForumlae` option in order to prevent malicious event entries from being parsed and executed by the Gophish user's spreadsheet software.

When a new PapaParse release is created, I'll update this code to use the updated minified file.

static/js/src/app/campaign_results.js

@@ -216,7 +216,9 @@ function exportAsCSV(scope) {
         return
     }
     $("#exportButton").html('<i class="fa fa-spinner fa-spin"></i>')
-    var csvString = Papa.unparse(csvScope, {})
+    var csvString = Papa.unparse(csvScope, {
+        'escapeFormulae': true
+    })
     var csvData = new Blob([csvString], {
         type: 'text/csv;charset=utf-8;'
     });