Remove sed modification for TA-Lib floating-point precision

- Delete the sed command that modified floating-point precision in ta_utility.h
- Simplify TA-Lib installation script

docker_build_helpers/install_ta-lib.sh

@@ -7,7 +7,6 @@ echo "Installing to ${INSTALL_LOC}"
 if [ ! -f "${INSTALL_LOC}/lib/libta_lib.a" ]; then
   tar zxvf ta-lib-0.6.1-src.tar.gz
   cd ta-lib-0.6.1 \
-  && sed -i.bak "s|0.00000001|0.000000000000000001|g" src/ta_func/ta_utility.h \
   && ./configure --prefix=${INSTALL_LOC}/ \
   && make \
   && which sudo && sudo make install || make install \