Fix ESP32-C6-DevkitC-1 pin number issue with USB (#115)

Pin numbers 18, 19, 20 and 21 was mixed up between the USB data signals
and the neighboring GND signals.

Author: nickoe

footprints/Espressif.pretty/ESP32-C6-DevKitC-1.kicad_mod

@@ -194,10 +194,10 @@
   (pad "15" thru_hole oval (at 0 35.56 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp b0374586-2bc8-434f-9bcb-b3f54b4a89cc))
   (pad "16" thru_hole oval (at 0 38.1 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp d3bc05fd-f3fd-477a-8f87-ab5e668d627a))
   (pad "17" thru_hole oval (at 22.86 38.1 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp d0dae0f9-8a88-4ef1-9511-18529adba88a))
-  (pad "18" thru_hole oval (at 22.86 33.02 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp a60f7623-e638-4072-8099-ba86a12ecc89))
-  (pad "19" thru_hole oval (at 22.86 35.56 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp 767d6240-4ee5-48a7-98b3-5cb707b449cb))
-  (pad "20" thru_hole oval (at 22.86 27.94 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp 25fa8036-8b5e-4bc0-b4cd-f4c726cf3d62))
-  (pad "21" thru_hole oval (at 22.86 30.48 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp f2d85f0b-cd4c-4e62-a8f6-7433cb5a7c23))
+  (pad "18" thru_hole oval (at 22.86 35.56 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp 767d6240-4ee5-48a7-98b3-5cb707b449cb))
+  (pad "19" thru_hole oval (at 22.86 33.02 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp a60f7623-e638-4072-8099-ba86a12ecc89))
+  (pad "20" thru_hole oval (at 22.86 30.48 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp f2d85f0b-cd4c-4e62-a8f6-7433cb5a7c23))
+  (pad "21" thru_hole oval (at 22.86 27.94 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp 25fa8036-8b5e-4bc0-b4cd-f4c726cf3d62))
   (pad "22" thru_hole oval (at 22.86 25.4 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp c40456a7-b09c-40b8-b35f-246e0f09c1f0))
   (pad "23" thru_hole oval (at 22.86 22.86 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp 6f6d496b-6b03-4b31-be82-29446a572c31))
   (pad "24" thru_hole oval (at 22.86 20.32 270) (size 1.2 2) (drill 0.8) (layers "*.Cu" "*.Mask") (tstamp c120d961-bf26-4a15-912e-9d7e57ef4081))