Use better variable names
Summary:
Use `p` and `c` instead of (reusing) `k`. This silences the following JSHint warning:
```
>>> Lint for webroot/rsrc/js/application/projects/behavior-project-boards.js:
Warning (W004) JSHintW004
'k' is already defined.
57 'phui-tag-shade-blue': (sum > 0 && !over_limit),
58 'phui-tag-shade-red': (over_limit)
59 };
>>> 60 for (var k in color_map) {
61 JX.DOM.alterClass(data.countTagNode, k, !!color_map[k]);
62 }
63 }
```
Test Plan: `arc lint`
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11066
02b2883555