fix: Remove "s" from Sorcerous Origin subclass flavor (#497)

Author: SleeplessOne1917

src/5e-SRD-Subclasses.json

@@ -1609,7 +1609,7 @@
       "url": "/api/classes/sorcerer"
     },
     "name": "Draconic",
-    "subclass_flavor": "Sorcerous Origins",
+    "subclass_flavor": "Sorcerous Origin",
     "desc": [
       "Your innate magic comes from draconic magic that was mingled with your blood or that of your ancestors. Most often, sorcerers with this origin trace their descent back to a mighty sorcerer of ancient times who made a bargain with a dragon or who might even have claimed a dragon parent. Some of these bloodlines are well established in the world, but most are obscure. Any given sorcerer could be the first of a new bloodline, as a result of a pact or some other exceptional circumstance."
     ],