tools: fix parsing of timestamp in gst-plot-timeline
tools: fix parsing of timestamp in gst-plot-timeline

lubosz/gstreamer,krieger-od/gstreamer,jpakkane/gstreamer,mrchapp/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,Distrotech/gstreamer,ahmedammar/platform_external_gst_gstreamer,drothlis/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,cfoch/gstreamer,ylatuya/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,magcius/gstreamer,krieger-od/gstreamer,magcius/gstreamer,jpakkane/gstreamer,ahmedammar/platform_external_gst_gstreamer,krichter722/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,lubosz/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,lubosz/gstreamer,drothlis/gstreamer,krichter722/gstreamer,mrchapp/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,mparis/gstreamer,cablelabs/gstreamer,collects/gstreamer,collects/gstreamer,justinjoy/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,cfoch/gstreamer,ylatuya/gstreamer,krichter722/gstreamer,ylatuya/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,ylatuya/gstreamer,Lachann/gstreamer,magcius/gstreamer,shelsonjava/gstreamer,collects/gstreamer,jpxiong/gstreamer,mparis/gstreamer,centricular/gstreamer,collects/gstreamer,lovebug356/gstreamer,centricular/gstreamer,drothlis/gstreamer,cablelabs/gstreamer,centricular/gstreamer,cablelabs/gstreamer,justinjoy/gstreamer,magcius/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,ahmedammar/platform_external_gst_gstreamer,surround-io/gstreamer,Distrotech/gstreamer,Lachann/gstreamer,Distrotech/gstreamer,jpakkane/gstreamer,mrchapp/gstreamer,lubosz/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,mparis/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,Distrotech/gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,ahmedammar/platform_external_gst_gstreamer,jpxiong/gstreamer,ylatuya/gstreamer,drothlis/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,krieger-od/gstreamer,ensonic/gstreamer,magcius/gstreamer,drothlis/gstreamer,Distrotech/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,mparis/gstreamer,collects/gstreamer