calendar: use normal type for EventPluginsManager, don't use singleton
It fixes that when there are multiple calendar applets, each applet doesn't have its own EventPluginsManager. BUG: 454846 FIXED-IN: 5.26
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It fixes that when there are multiple calendar applets, each applet doesn't have its own EventPluginsManager. BUG: 454846 FIXED-IN: 5.26