Revert "Add support for installing retail 0x3D[0] key-encrypted CIAs on dev units"

This reverts commit 5adb8749de.

source/patches.c

@@ -276,9 +276,8 @@ u32 patchCheckForDevCommonKey(u8 *pos, u32 size)
     if(off == NULL) ret = 1;
     else
     {
-        *off = ISDEVUNIT ? 0x2300 : 0x2301; //mov r3, #0 or 1
-        //use the dev common key as 1st common key on retail, vice-versa on dev
-        
+        *off = 0x2301; //mov r3, #1
+
         ret = 0;
     }
 
@@ -755,4 +754,4 @@ u32 patchAgbBootSplash(u8 *pos, u32 size)
     }
 
     return ret;
-}
+}