Fixed checkbox not checked in FormWrapper

[73VW]

fix for #558

So I've reverse engineered the value of the annotation when it was checked and not checked and I have found that you were missing the value of /V.

The value of annot in the base template:

{'/AP': {'/D': {'/Off': IndirectObject(19, 0, 139905065837776), '/Yes': IndirectObject(20, 0, 139905065837776)}, '/N': {'/Off': IndirectObject(22, 0, 139905065837776), '/Yes': IndirectObject(23, 0, 139905065837776)}}, '/AS': '/Off', '/F': 4, '/FT': '/Btn', '/MK': {'/BC': [0.0], '/BG': [1], '/CA': '4'}, '/P': IndirectObject(4, 0, 139905065837776), '/Rect': [358.874, 664.717, 377.354, 683.197], '/Subtype': '/Widget', '/T': 'check', '/Type': '/Annot', }

The value of the annot in a manually checked and saved file:

{'/AP': {'/D': {'/Off': IndirectObject(19, 0, 139905065837776), '/Yes': IndirectObject(20, 0, 139905065837776)}, '/N': {'/Off': IndirectObject(22, 0, 139905065837776), '/Yes': IndirectObject(23, 0, 139905065837776)}}, '/AS': '/Yes', '/F': 4, '/FT': '/Btn', '/MK': {'/BC': [0.0], '/BG': [1], '/CA': '4'}, '/P': IndirectObject(4, 0, 139905065837776), '/Rect': [358.874, 664.717, 377.354, 683.197], '/Subtype': '/Widget', '/T': 'check', '/Type': '/Annot', '/V': '/Yes'}

The value of the annot after checking it with your package:

{'/AP': {'/D': {'/Off': IndirectObject(19, 0, 139905065837776), '/Yes': IndirectObject(20, 0, 139905065837776)}, '/N': {'/Off': IndirectObject(22, 0, 139905065837776), '/Yes': IndirectObject(23, 0, 139905065837776)}}, '/AS': '/Yes', '/F': 4, '/FT': '/Btn', '/MK': {'/BC': [0.0], '/BG': [1], '/CA': '4'}, '/P': IndirectObject(4, 0, 139905065837776), '/Rect': [358.874, 664.717, 377.354, 683.197], '/Subtype': '/Widget', '/T': 'check', '/Type': '/Annot'

I've concluded that you had to put the /V (value I think) and this seems to work.

Also, I've added the option to uncheck a checkbox if you need to.

Best

[chinapandaman]

Closing as this duplicates #564