Update .gitignore to correct angular cache directory path

Author: bbodine1

clients/html/.gitignore

@@ -25,7 +25,7 @@
 !.vscode/extensions.json
 
 # misc
-/.angular/cache
+/.angular/cache
 /.sass-cache
 /connect.lock
 /coverage
@@ -34,7 +34,7 @@ npm-debug.log
 yarn-error.log
 testem.log
 /typings
-.angular/
+/.angular
 
 # System Files
 .DS_Store