Sqlite: Improve SqliteStatement column check

We have done it for every getter. Now we do it only once as we ask for
the values. It simplifies the code and the test and could even improve
performance.

Change-Id: Ia7d4a33a77ec7c0a5fda548424fbf8b192f07511
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/libs/sqlite/sqliteexception.h

@@ -119,13 +119,12 @@ public:
     }
 };
 
-class InvalidColumnFetched : public Exception
+class ColumnCountDoesNotMatch : public Exception
 {
 public:
-    InvalidColumnFetched(const char *whatErrorHasHappen)
+    ColumnCountDoesNotMatch(const char *whatErrorHasHappen)
         : Exception(whatErrorHasHappen)
-    {
-    }
+    {}
 };
 
 class BindingIndexIsOutOfRange : public Exception