wasm: Fix keyboard popping up on cell and tablets

The fix for text/button broke cellphones and tablets.
(QTBUG-136562)

The fix is reverted on 6.9, and fixed here on 6.10

The fix is to set inputMode so that it matches the focus.

Change-Id: I88b0a32787ff97b6f5b057e4ebd240f565b5a284
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/plugins/platforms/wasm/qwasminputcontext.cpp

@@ -343,6 +343,7 @@ void QWasmInputContext::updateInputElement()
         else
             m_inputElement.call<void>("blur");
 
+        m_inputElement.set("inputMode", std::string("none"));
         return;
     }
 
@@ -368,6 +369,7 @@ void QWasmInputContext::updateInputElement()
     m_inputElement.set("selectionStart", queryEvent.value(Qt::ImAnchorPosition).toUInt());
     m_inputElement.set("selectionEnd", queryEvent.value(Qt::ImCursorPosition).toUInt());
 
+    m_inputElement.set("inputMode", std::string("text"));
     m_inputElement.call<void>("focus");
 }