fix(core): Do not clear condition when clearing all filters
fix(core): Do not clear condition when clearing all filters

When a user clicks the grid menu's "clear all filters", do not remove the filter's 9possibly custom)

`condition`.

Fixes #4657

kamikasky/ui-grid,AgDude/ng-grid,bjossi86/ui-grid,ntmuigrid/ntmuigrid,angular-ui/ng-grid,angular-ui/ui-grid,kamikasky/ui-grid,bjossi86/ui-grid,dlgski/ui-grid,InteractiveIntelligence/ng-grid,Servoy/ng-grid,AgDude/ng-grid,dbckr/ui-grid,kamikasky/ui-grid,bjossi86/ui-grid,angular-ui/ng-grid,mportuga/ui-grid,AgDude/ng-grid,Servoy/ng-grid,Servoy/ng-grid,mportuga/ui-grid,dlgski/ui-grid,InteractiveIntelligence/ng-grid,ntmuigrid/ntmuigrid,dlgski/ui-grid,angular-ui/ng-grid,ntmuigrid/ntmuigrid,InteractiveIntelligence/ng-grid,mportuga/ui-grid,kenwilcox/ui-grid,kenwilcox/ui-grid,dbckr/ui-grid,dbckr/ui-grid,angular-ui/ui-grid,angular-ui/ui-grid,kenwilcox/ui-grid