Is it wrong that my dryer plug has one L shaped prong?
You have an obsolete, dangerous  NEMA 10-50
It's a member of the NEMA 10 family which has been outlawed for 30 years because it has a very dangerous failure mode.  If anything goes wrong with the neutral wire, the chassis of the range/dryer becomes energized!
In a remodel you are required to come up to current Codes.  No electrician would ever install a 10-30 (let alone a 10-50!) as it would be instantly written up by the inspector.
However it should be easy enough to change the recep to NEMA 14-30.  Just get a thing that looks just like that, but is a 14-30 instead.  Here are the three 30A styles.

The left one is correct for a dryer.
You must change the dryer cord according to the dryer's instructions (search the web).  An essential part of this is removing a &quot;grounding strap&quot; which attaches the dryer chassis to neutral (which was bad).