Make Save button disabled after canceling User's password changes

[hstastna]

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1762791

There was a bug regarding responding of Save button (Save and Reset buttons are together enabled or disabled like one) on changes of User's password: after clicking on Cancel button for canceling editing the password (not canceling editing User's info!), Save button was still enabled even when there wasn't any change in the User's info, and after clicking on Save error occurred.

The core of the problem is value vs. placeholder attribute of password_field_tag. Because of that, string with dots '●●●●●●●●' appeared in params[:password] after clicking on Cancel button, so then this value was copied to @edit[:new][:password] (which was nil originally, at the beginning of editing User's info) and here changed variable was set to true, so then Save, Reset buttons remained enabled.

Here is the place where we've set dots as a value, after canceling editing password. I don't see any reason for it. Also, the name of the variable storedPasswordPlaceholder used there also suggests that it's about setting the placeholder, not value.

---

Editing User's password - Save, Reset buttons enabled as expected:

Before: (after canceling User's password change Save, Reset buttons still enabled!)

After: (after canceling User's password change Save, Reset buttons disabled as expected)

[miq-bot]

Checked commit hstastna@79226e4 with ruby 2.4.6, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0
0 files checked, 0 offenses detected
Everything looks fine. 👍

[hstastna]

@ZitaNemeckova @h-kataria @himdel Could you, please, review the changes for fixing the BZ or ping anyone else? I will appreciate any feedback on this PR. Thanks! :)

[ZitaNemeckova]

Tested in UI. LGMT 👍