Designer: Fix struct/class warning
Designer: Fix struct/class warning

In file included from /home/nik/dev/creator/creator-master/src/plugins/designer/editorwidget.cpp:31:
/home/nik/dev/creator/creator-master/src/plugins/designer/formeditorw.h:70:1: warning: struct 'EditorData' was previously declared as a class [-Wmismatched-tags]
struct EditorData;
^
/home/nik/dev/creator/creator-master/src/plugins/designer/editorwidget.h:47:7: note: previous use is here
class EditorData;
      ^

Change-Id: Ib17540b30f64e8a25d0910c5601ad99a9a43345d
Reviewed-by: hjk <f81b91af79013637d070c18d38a75b90eaae8ba3@nokiamail.com>

danimo/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,maui-packages/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,maui-packages/qt-creator,danimo/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,danimo/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,kuba1/qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,farseerri/git_code,martyone/sailfish-qtcreator,xianian/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,farseerri/git_code,maui-packages/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,farseerri/git_code,maui-packages/qt-creator,kuba1/qtcreator,xianian/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,Distrotech/qtcreator,maui-packages/qt-creator,Distrotech/qtcreator,farseerri/git_code,farseerri/git_code,kuba1/qtcreator,amyvmiwei/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,farseerri/git_code,kuba1/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator