Fix #9 issue with split arg

I think this never worked correctly, but tmux silently accepted it until
this version, fzf-tmux will not run correctly when passing a string, or
it did before, not quite sure, but this resolves the issue on all
versions

.travis.yml

@@ -2,7 +2,6 @@ dist: jammy
 
 before_install:
   - sudo apt-get install -y git-core expect vim
-  - sudo apt-get install -y python-software-properties software-properties-common
   - sudo apt-get install -y build-essential libtool autotools-dev autoconf
   - sudo apt-get install -y pkg-config bison
   - sudo apt-get install -y wget tar libevent-dev libncurses-dev

scripts/fuzzback.sh

@@ -14,7 +14,7 @@ SUPPORTED_VERSION="2.4"
 . "$CURRENT_DIR/helpers.sh"
 
 fzf_split_cmd() {
-  fzf-tmux -d "70%" \
+  fzf-tmux -d 50 \
     --delimiter=":" \
     --ansi \
     --with-nth="3.." \