Fix typo in incompatibility warning message

This is the actual fix that we couldn't do due to the string freeze.

Contributes to issue CURA-2626.

cura/Settings/MachineManager.py

@@ -73,7 +73,7 @@ class MachineManager(QObject):
         self._auto_hotends_changed = {}
 
         self._material_incompatible_message = Message(catalog.i18nc("@info:status",
-                                              "The selected material is imcompatible with the selected machine or configuration."))
+                                              "The selected material is incompatible with the selected machine or configuration."))
 
     globalContainerChanged = pyqtSignal() # Emitted whenever the global stack is changed (ie: when changing between printers, changing a global profile, but not when changing a value)
     activeMaterialChanged = pyqtSignal()

plugins/CuraEngineBackend/CuraEngineBackend.py

@@ -230,7 +230,7 @@ class CuraEngineBackend(Backend):
         if job.getResult() == StartSliceJob.StartJobResult.MaterialIncompatible:
             if Application.getInstance().getPlatformActivity:
                 self._error_message = Message(catalog.i18nc("@info:status",
-                                            "The selected material is imcompatible with the selected machine or configuration."))
+                                            "The selected material is incompatible with the selected machine or configuration."))
                 self._error_message.show()
                 self.backendStateChange.emit(BackendState.Error)
             else: