Two more columnNumber() calls that should be positionInBlock()

columnNumber() relies on text wrapping, and we're only interested in the
position of the cursor in the block.

src/plugins/cpptools/cppcodecompletion.cpp

@@ -640,7 +640,7 @@ bool CppCodeCompletion::triggersCompletion(TextEditor::ITextEditable *editor)
             if (TextEditor::BaseTextEditor *edit = qobject_cast<TextEditor::BaseTextEditor *>(editor->widget())) {
                 QTextCursor tc(edit->document());
                 tc.setPosition(pos);
-                return tc.columnNumber() == 1;
+                return tc.positionInBlock() == 1;
             }
 
             return false;