master: float_(placement|alignment) only written on doc settings change

[Scott Kostyshak]

To reproduce:

1. Start a new document with master and save it.
2. Copy that file to a new file (we will look at the diff).
3. Open one of the files, go to Document Settings, and check the box
   "Suppress default date on front page".
4. Press "Apply".
5. Uncheck "Suppress default date on front page".
6. Save.
7. diff both files.

The following buffer parameters are the difference:

  \float_placement class
  \float_alignment class

Scott
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