R1:02b2883555c6

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…