IS: Cleanup some redundant rows.
Over time values that are redundant to defaults were added that further
made this convoluted file even more cumbersome to handle.
- Remove 4 redundant rows with 'true' in wgEnableUploads where default
is already 'true'
- Remove 10 redundant rows with 'false' in wgUploadNavigationUrl where
default is already 'false'