Make sure LIB_ID escape context allows for formatting constructs.

Also make sure that value field is updated from name changes when the
symbol is a power symbol (even if it's from the schematic instead of
the library).

Fixes https://gitlab.com/kicad/code/kicad/issues/11093

eeschema/fields_grid_table.cpp

@@ -561,7 +561,7 @@ void FIELDS_GRID_TABLE<T>::SetValue( int aRow, int aCol, const wxString &aValue
                 value = fn.GetFullPath();
             }
         }
-        else if( m_frame->IsType( FRAME_SCH_SYMBOL_EDITOR ) && aRow == VALUE_FIELD )
+        else if( m_parentType == SCH_SYMBOL_T && aRow == VALUE_FIELD )
         {
             value = EscapeString( value, CTX_LIBID );
         }