ecm.eclass: set KDE_DEBUG=1 for ecm_src_test

The KDE_DEBUG variable [1] prevents crash handlers such as DrKonqi from launching
if a test were to segfault.

This prevents a hanging test phase where DrKonqi has launched and is waiting
for input on the virtx display.

[sam: We already try to disable apport/similar crash reporters because they
slow down tests, don't always play well in sandbox, and confuse users, so
this seems like a natural change.]

[1]: https://userbase.kde.org/KDE_System_Administration/Environment_Variables#KDE_DEBUG

Signed-off-by: James Beddek <telans@posteo.de>
Closes: https://github.com/gentoo/gentoo/pull/22643
Signed-off-by: Sam James <sam@gentoo.org>

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