Replace sendme by current_page text sensor

Solves #1900

hmi/dev/nspanel_blank_code/blank.txt

@@ -12,7 +12,12 @@ Page blank
     
     Events
         Preinitialize Event
-            sendme
+            printh 92
+            prints "current_page",0
+            printh 00
+            prints "blank",0
+            printh 00
+            printh FF FF FF
             dim=100
             covx baud,baud_rate.txt,0,0
             baud_rate.txt+=" bps"
@@ -83,7 +88,7 @@ Text tft_version
         Dragging           : 0
         Send Component ID  : on press and release
         Associated Keyboard: none
-        Text               : TFT: v2024.1.2
+        Text               : TFT: v2024.3.0
         Max. Text Size     : 20
     
     Events
@@ -189,7 +194,12 @@ Timer tm_esphome
             {
                 rest
             }
-            sendme
+            printh 92
+            prints "current_page",0
+            printh 00
+            prints "blank",0
+            printh 00
+            printh FF FF FF
             printh 91
             prints "display_mode",0
             printh 00