[FIX] web: do not clearUncommittedChanges for function actions

Before this commit: In res.config.settings form view when user change something
in form and click on button in form then it will display to save the unsaved
changes, when we click 'Save' button from dialog still dialog remain there
it is not closed(while record is saved in background, just dialog is not closed)

This is because we called 'clearUncommittedChanges' method before executing
client action, 'Save' button on dialog returns client action for reload page
but as we calling 'clearUncommittedChanges' so it will call 'canBeDiscarded'
method of 'BaseSettingController' which again show dialog for unsaved changes.

After this commit: unsaved changes dialog is closed on clicking 'Save' button
from dialog, we called 'clearUncommittedChanges' method only if clientAction is
instance of Component, i.e. if client action is type of function which is our
case, reload is client action which type of function so in that case we do not
need to call 'clearUncommittedChanges'.

task-2662302

closes odoo/odoo#77839

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>