[Qgis-developer] fix in postgresprovider

[Marco Hugentobler]

Dear qgis devs,

I did a fix in the postgresprovider. Because release is so close, it would be 
good if postgis experts could have a look so that the fix doesn't cause other 
problems.

postgresprovider, l. 201

before: mUri.password = password.left(n-1);
now: mUri.password = password.left(n);

thanks,
Marco