Disable handraise reset on raise_hands_disabled

Fixes

Issue 2: App crashes if moderator reset raised hands after hand raising is disabled

of the opentalk/product/tickets#343 (closed)

summary

As discussed in opentalk/product/tickets#343 (comment 625032)

Disable "Reset raised hands" buttons in case handraises are disabled in a room.

Add an explanational tooltip, why the buttons are disabled

mockups

assets

• DE: "Nicht verfügbar, da Melden per Handzeichen deaktiviert ist."
• EN: "Not available while raise hand is disabled."

acceptance criteria

• If handraises are disabled in a room, the rest raishands buttons must be disabled and the explanational tooltips must be added
• Handle possible raise_hands_disabled error with a silent logging