Add windows-specific result files for form_combobox_num/per tests.

The output from these clever tests depends upon the platform-specific
behaviour of fcvt() when more significant digits are requested
than there is precision in a double type.

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1075643002
diff --git a/fx/new/form/form_combobox_num_expected_win.pdf.0.png b/fx/new/form/form_combobox_num_expected_win.pdf.0.png
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diff --git a/fx/new/form/form_combobox_per_expected_win.pdf.0.png b/fx/new/form/form_combobox_per_expected_win.pdf.0.png
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