esp32/boards: Update UM board image names for consistency.

Signed-off-by: Seon Rozenblum <seon@unexpectedmaker.com>

ports/esp32/boards/UM_FEATHERS2NEO/board.json

@@ -17,7 +17,7 @@
         "5x5 RGB LED Matrix"
     ],
     "images": [
-        "FeatherS2_Neo_White_Product2.jpg"
+        "unexpectedmaker_feathers2neo.jpg"
     ],
     "mcu": "esp32s2",
     "product": "Feather S2 Neo",

ports/esp32/boards/UM_TINYPICO/board.json

@@ -16,7 +16,7 @@
         "TinyPICO Compatible"
     ],
     "images": [
-        "tinypico-v2-both.jpg"
+        "unexpectedmaker_tinypico.jpg"
     ],
     "mcu": "esp32",
     "product": "TinyPICO",

ports/esp32/boards/UM_TINYS2/board.json

@@ -16,7 +16,7 @@
         "TinyPICO Compatible"
     ],
     "images": [
-        "TinyS2+Product+Shot.jpg"
+        "unexpectedmaker_tinys2.jpg"
     ],
     "mcu": "esp32s2",
     "product": "Tiny S2",