Use layer numbers in Eagle importer

The layer names may be translated but the numbers are invariant.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/19597

(cherry picked from commit 4ba1c0130c)

eeschema/sch_io/eagle/sch_io_eagle.cpp

@@ -220,12 +220,22 @@ void SCH_IO_EAGLE::loadLayerDefs( wxXmlNode* aLayers )
          * </layers>
          */
 
-        if( elayer.name == wxT( "Nets" ) )
+        switch ( elayer.number)
+        {
+        case 91:
             m_layerMap[elayer.number] = LAYER_WIRE;
-        else if( elayer.name == wxT( "Info" ) || elayer.name == wxT( "Guide" ) )
-            m_layerMap[elayer.number] = LAYER_NOTES;
-        else if( elayer.name == wxT( "Busses" ) )
+            break;
+        case 92:
             m_layerMap[elayer.number] = LAYER_BUS;
+            break;
+        case 97:
+        case 98:
+            m_layerMap[elayer.number] = LAYER_NOTES;
+            break;
+
+        default:
+            break;
+        }
     }
 }