boards: Wemos D1 R1 needs a separate defined identifier (#4304)

Author: d-a-v

boards.txt

@@ -2481,7 +2481,7 @@ d1_mini_lite.menu.UploadSpeed.512000.upload.speed=512000
 
 ##############################################################
 d1.name=WeMos D1 R1
-d1.build.board=ESP8266_WEMOS_D1MINI
+d1.build.board=ESP8266_WEMOS_D1R1
 d1.build.variant=d1
 d1.upload.tool=esptool
 d1.upload.maximum_data_size=81920

tools/boards.txt.py

@@ -553,7 +553,7 @@
     ( 'd1', {
         'name': 'WeMos D1 R1',
         'opts': {
-            '.build.board': 'ESP8266_WEMOS_D1MINI',
+            '.build.board': 'ESP8266_WEMOS_D1R1',
             '.build.variant': 'd1',
             },
         'macro': [