Use /tmp, not /var/tmp

At least on Fedora this is tmpfs

dotfiles/bash/main.bashrc

 alias sc='se --direction=encz.cz'
 alias lsblk='lsblk -o +UUID,LABEL'
 
-RV_TMP="/var/tmp/bash-rv"
+RV_TMP="/tmp/bash-rv"
 mkdir -p "$RV_TMP"
 
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