Fix wscript (thanks to @ogerardin) to avoid needing two build runs

An error in the wscript file meant the generated Javascript file
wasn't being included in the final pbw file. This change fixes
this, with thanks to Olivier Gérardin (https://github.com/ogerardin)
for highlighting the problem and identifying the fix.

wscript

@@ -73,7 +73,7 @@ def build(ctx):
 
     # Bundle everything needed into the pbw file
     ctx.set_group('bundle')
-    ctx.pbl_bundle(binaries=binaries, js=ctx.path.ant_glob('src/js/pebble-js-app.js'))
+    ctx.pbl_bundle(binaries=binaries, js='../src/js/pebble-js-app.js')
 
 def generate_appinfo_h(task):
     src = task.inputs[0].abspath()