Utils: Adjust column numbers affected by convertPosition change

convertPosition change was introduced in 931ec39f64.
It changed 0-based column to 1-based which is how it
naturally is in Qt Creator.

This fixed some usages but broke many more. This is an
attempt to fix the remaining use cases.

Fixes CppEditor auto-tests.

Change-Id: Ia8d14da0ebb035cd2fdd6da4ff6ec89c1c5121a8
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/cppcompletionassist.h

@@ -113,7 +113,7 @@ private:
     bool tryObjCCompletion();
     bool objcKeywordsWanted() const;
     int startCompletionInternal(const QString &fileName,
-                                unsigned line, unsigned column,
+                                unsigned line, unsigned positionInBlock,
                                 const QString &expression,
                                 int endOfExpression);