event: fix seek event creation

Creating seek events segfaults on 32-bit ARM since commit 2fa15d53
('event: add new seek parameter, "trickmode-interval"'), which missed
casting the trickmode-interval initializer in the variable argument list
to guint64.
17 jobs for event-seek-fix in 86 minutes and 42 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Preparation
passed #234074
gst indent

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passed #234073
manifest

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  Build
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build fedora x86_64

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build nodebug fedora x86_64

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  Test
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check fedora

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passed #234078
integration testsuites fedora

00:11:49

 
  Full Builds
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build cerbero android universal

00:16:57

passed #234081
build cerbero cross win32

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passed #234082
build cerbero cross win64

00:09:48

passed #234079
build cerbero fedora x86_64

00:10:41

 
  Full Tests
passed #234087
valgrind bad

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passed #234084
valgrind base

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passed #234083
valgrind core

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passed #234316
valgrind good

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passed #234086
valgrind ugly

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failed #234085
valgrind good

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  Apps
passed #234088
android universal examples

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