cppcheck: fix prefer ++/-- for non primitive types

Here, we can just initialize the iterators with the right increment
instead of using while loops to increment them

Change-Id: I08b51ba11398dbb705d3ed83bfbf46df0deb7f21
Reviewed-on: https://gerrit.libreoffice.org/47224
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

svx/source/table/tablemodel.cxx

@@ -67,21 +67,7 @@ template< class Vec, class Iter > void remove_range( Vec& rVector, sal_Int32 nIn
         }
         else
         {
-            Iter aBegin( rVector.begin() );
-            while( nIndex-- )
-                aBegin++;
-            if( nCount == 1 )
-            {
-                rVector.erase( aBegin );
-            }
-            else
-            {
-                Iter aEnd( aBegin );
-
-                while( nCount-- )
-                    aEnd++;
-                rVector.erase( aBegin, aEnd );
-            }
+            rVector.erase(rVector.begin() + nIndex, rVector.begin() + nIndex + nCount);
         }
     }
 }