TextEditor: Fix qbs build.

Change-Id: Ib4f62c72bd469eeec084e79a3390e92aeb351b22
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/texteditor/texteditor.qbs

@@ -41,6 +41,8 @@ QtcPlugin {
         "codestyleselectorwidget.cpp",
         "codestyleselectorwidget.h",
         "codestyleselectorwidget.ui",
+        "colorpreviewhoverhandler.cpp",
+        "colorpreviewhoverhandler.h",
         "colorscheme.cpp",
         "colorscheme.h",
         "colorschemeedit.cpp",