fix(options): use the dialog's Text font string in the Hardcore import popup

[GisliRAxels]

Description

On a Classic Era Hardcore realm, importing an aura that contains custom code shows WEAKAURAS_CONFIRM_IMPORT_HARDCORE, and both of its handlers throw:

WeakAurasOptions/OptionsFrames/Update.lua:1636: attempt to index field 'text' (a nil value)
WeakAurasOptions/OptionsFrames/Update.lua:1639: attempt to index field 'text' (a nil value)

Failure path on Classic Era 1.15.9 (69722):

• Import calls StaticPopup_Show (Update.lua:1647), which calls dialog:Show() (Blizzard_StaticPopup/StaticPopup.lua:391).
• The dialog's OnShow script is GameDialogMixin:OnShow (Blizzard_StaticPopup_Game/GameDialog.lua:690). It calls StaticPopup_OnShow, which calls this popup's OnShow.
• StaticPopup1–4 inherit StaticPopupTemplate (GameDialog.xml:78). That template's font string is parentKey="Text" (GameDialog.xml:94), and GameDialogMixin:GetTextFontString() returns self.Text.
• There is no .text field, so both handlers index nil.

#6323 reports that the import cannot be confirmed while this happens.

The popup is only created on Classic Era with Hardcore active (WeakAuras.IsClassicEra() and C_GameRules.IsHardcoreActive()), so it now reads self.Text directly. For comparison, WEAKAURAS_CONFIRM_REPAIR, which runs on every client, reads self.Text or self.text.

Fixes #6323

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

• Before the change, on Classic Era 1.15.9 with WeakAuras 5.22.0 on a Hardcore realm (EU): importing an aura with custom code raised both errors above, twice.
• With the change, not yet run in game. The reporter of Classic Era Hardcore: importing an aura with custom code fails - "attempt to index field 'text'" in the hardcore confirmation popup (Update.lua:1636) #6323 verified the equivalent (self.Text or self.text) change on a Hardcore realm. On 1.15.9 that evaluates to self.Text, the field this change reads.
• git diff --check is clean, and the file parses with LuaJIT (Lua 5.1 syntax). Luacheck was not available locally; CI runs it.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas (the reason is in the commit message)
• I have made corresponding changes to the documentation (none needed)
• My changes generate no new warnings (not checked locally; Luacheck runs in CI)

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Written by an agent (Claude Code, claude-opus-5-5).

[InfusOnWoW]

There's already a fix for this pending.