Fix typo, daffodilDebugClassPath -> daffodilDebugClasspath

Closes #357
diff --git a/src/daffodilDebugger.ts b/src/daffodilDebugger.ts
index 9f6e6fa..a60bfb3 100644
--- a/src/daffodilDebugger.ts
+++ b/src/daffodilDebugger.ts
@@ -167,7 +167,7 @@
       // Get daffodilDebugger class paths to be added to the debugger
       let daffodilDebugClasspath = ''
 
-      if (config.daffodilDebugClassPath) {
+      if (config.daffodilDebugClasspath) {
         daffodilDebugClasspath = config.daffodilDebugClasspath.includes(
           '${workspaceFolder}'
         )