Should be optional not included applications

To satisfy dialyzer in OTP 26, included_applications was used in b8fbcd2

However, this should be optional_applications as these appas will not necessarily be started

src/sidejob.app.src

@@ -5,9 +5,11 @@
   {registered, []},
   {applications, [
                   kernel,
-                  stdlib
+                  stdlib,
+                  syntax_tools,
+                  compiler
                  ]},
-  {included_applications, [syntax_tools, compiler]},
+  {optional_applications, [syntax_tools, compiler]},
   {registered, []},
   {mod, {sidejob_app, []}},
   {env, []}