ResourceEditor: Fix typos in non-translatable, but user-visible strings

RessourceEditor.RemoveNonExistign > ResourceEditor.RemoveNonExisting
in Tools > Options > Environment > Keyboard.

Change-Id: I4c76c216350f1984d6429db74a60190928332a65
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/resourceeditor/resourceeditorconstants.h

@@ -39,7 +39,7 @@ const char C_RESOURCE_MIMETYPE[] = "application/vnd.qt.xml.resource";
 const char C_ADD_PREFIX[] = "ResourceEditor.AddPrefix";
 const char C_REMOVE_PREFIX[] = "ResourceEditor.RemovePrefix";
 const char C_RENAME_PREFIX[] = "ResourceEditor.RenamePrefix";
-const char C_REMOVE_NON_EXISTING[] = "RessourceEditor.RemoveNonExistign";
+const char C_REMOVE_NON_EXISTING[] = "ResourceEditor.RemoveNonExisting";
 
 const char C_REMOVE_FILE[] = "ResourceEditor.RemoveFile";
 const char C_RENAME_FILE[] = "ResourceEditor.RenameFile";