Fix incorrect override of GetLayoutOrder().

fsdk_baseform.h:63:19: error: 'CPDFSDK_Widget::GetLayoutOrder' hides overloaded virtual function [-Werror,-Woverloaded-virtual]
        virtual int                                             GetLayoutOrder() {return 2;}
                                                                ^
fsdk_baseannot.h:70:18: note: hidden overloaded virtual function 'CPDFSDK_Annot::GetLayoutOrder' declared here: different qualifiers (const vs none)
        virtual int                                     GetLayoutOrder() const { return 5; }
                                                        ^

On Windows, I believe MSVS treats these as override since it's such a common and
easy mistake, but clang and gcc do what the standard specifies. Add a "const" to
the function in the subclass so that this is actually an override, as intended.

BUG=pdfium:29
R=bo_xu@foxitsoftware.com

Review URL: https://codereview.chromium.org/427173002

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