Added KeyEventType check for keyboard events tutorial (#1877)

Added KeyEventType check for keyboard events tutorial in response to https://github.com/JetBrains/compose-jb/issues/1871

tutorials/Keyboard/README.md

@@ -38,6 +38,8 @@ import androidx.compose.ui.input.key.Key
 import androidx.compose.ui.input.key.isCtrlPressed
 import androidx.compose.ui.input.key.key
 import androidx.compose.ui.input.key.onPreviewKeyEvent
+import androidx.compose.ui.input.key.type
+import androidx.compose.ui.input.key.KeyEventType
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.singleWindowApplication
 
@@ -53,12 +55,12 @@ fun main() = singleWindowApplication {
                 onValueChange = { text = it },
                 modifier = Modifier.onPreviewKeyEvent {
                     when {
-                        (it.isCtrlPressed && it.key == Key.Minus) -> {
+                        (it.isCtrlPressed && it.key == Key.Minus && it.type == KeyEventType.KeyUp) -> {
                             consumedText -= text.length
                             text = ""
                             true
                         }
-                        (it.isCtrlPressed && it.key == Key.Equals) -> {
+                        (it.isCtrlPressed && it.key == Key.Equals && it.type == KeyEventType.KeyUp) -> {
                             consumedText += text.length
                             text = ""
                             true