+1 to what z415 said.
"...can either 1) loosen the tension screw for the non touching side and then tighten the one for the touching side (likely the easiest to do), 2) fiddle with the combination of washers in the pad set up to thicken the non-touching side and "thin" the touching side (more involved than option 1 but may be necessary if other options don't help), 3) you can change the holes that the springs go in (Also fairly simple but does require simple disassemble/reassembly), 4) you might want to check to see if the wheels dish is correct (an easy way to check this on front wheel without disc brakes is to just flip the wheel, remount and see if the rubbing changes and if it does likely the dish needs to be dealt with but that is more complicated than all other choices), 5) dismantle the clean, lube and bend the weaker spring (easy to do along with or in addition to option 3 above), or 6) any combination of the above."

I'd also add this in connection with option 4 - check.. Make wheel is seated properly in the dropouts. If not it can affect brake rubbing. And a further thought is wheel truing in general, of which dishing is one aspect, affects V-brake performance. Rubbing on just one side as you seem to be experiencing, and if it rubs constantly not intermittently, does point to the dishing as more likely. Intermittent rubbing says lateral wheel truing is needed.