Move page constructors to TFT

To reduce comms between ESPHome and Nextion, which could help with some sync issues found with 921600 bps.

advanced/hmi/nspanel_eu_code/keyb_num.txt

@@ -106,7 +106,7 @@ Button bclose
         Send Component ID: on press and release
         State            : unpressed
         Text             : î…˜
-        Max. Text Size   : 10
+        Max. Text Size   : 3
     
     Events
         Touch Release Event
@@ -231,8 +231,8 @@ Button bclear
         Dragging         : 0
         Send Component ID: on press
         State            : unpressed
-        Text             : <
-        Max. Text Size   : 5
+        Text             : 
+        Max. Text Size   : 3
     
     Events
         Touch Release Event
@@ -259,7 +259,7 @@ Button benter
         Dragging         : 0
         Send Component ID: on press
         State            : unpressed
-        Text             : OK
+        Text             : î„«
         Max. Text Size   : 3
     
     Events
@@ -279,7 +279,7 @@ Button bview
         Dragging         : 0
         Send Component ID: on press and release
         State            : unpressed
-        Text             : O
+        Text             : 
         Max. Text Size   : 3
     
     Events