Fix last character missing from strings in XFA Month Calendar.

This was a bug introduced in a refactor a long, long time ago.
A line was removed (probably unintentionally).
https://chromiumcodereview.appspot.com/2435603003/diff/40001/xfa/fxfa/app/xfa_fwltheme.cpp

Bug: pdfium:751
Change-Id: I0e3d094a543bd0e31010a8093387906d62c0a5dc
Reviewed-on: https://pdfium-review.googlesource.com/31830
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
diff --git a/xfa/fxfa/cxfa_fwltheme.cpp b/xfa/fxfa/cxfa_fwltheme.cpp
index 4dd7024..d1739f4 100644
--- a/xfa/fxfa/cxfa_fwltheme.cpp
+++ b/xfa/fxfa/cxfa_fwltheme.cpp
@@ -239,6 +239,7 @@
     m_pTextOut->SetAlignment(pParams->m_iTTOAlign);
     m_pTextOut->SetStyles(pParams->m_dwTTOStyles);
     m_pTextOut->CalcLogicSize(pParams->m_wsText, rect);
+    return;
   }
 
   CXFA_FFWidget* pWidget = XFA_ThemeGetOuterWidget(pParams->m_pWidget);