Update xorm redis cacher to use the xorm logger instead of a special seperate one

go.sum

@@ -13,10 +13,10 @@ code.vikunja.io/web v0.0.0-20200208214421-c90649369427 h1:6ps5r0OxZNRdmCavh1k/xM
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@@ -138,12 +138,6 @@ github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LB
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@@ -270,6 +264,7 @@ github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hd
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@@ -359,8 +354,7 @@ github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqn
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@@ -618,11 +612,8 @@ src.techknowlogick.com/xgo v0.0.0-20200408234745-bb0faa361273 h1:dE6ry9rVwDn3soD
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