Update install documentation for Ubuntu

The documentation is wrong. This is given:

cmake -D CMAKE_PREFIX_PATH="$HOME/deps/fmilibrary;$HOME/deps/open-simulation-interface;$HOME/deps/protobuf;$HOME/deps/protobuf-shared;$HOME/deps/units;$HOME/deps/mantleapi;$HOME/deps/yase;$HOME/deps/openscenario_api;$HOME/deps/openscenario_engine;$HOME/deps/gtest;$HOME/deps/boost;$HOME/deps/qt;$HOME/deps/minizip;C:/deps" \
-D CMAKE_INSTALL_PREFIX=/usr/local/openPASS/bin/core \
-D CMAKE_BUILD_TYPE=Release \
-D USE_CCACHE=ON \
-D WITH_DEBUG_POSTFIX=OFF \
-D OPENPASS_ADJUST_OUTPUT=OFF \
-D INSTALL_EXTRA_RUNTIME_DEPS=ON \
..

This is the actual command that works - sudo cmake -D CMAKE_PREFIX_PATH="$HOME/deps/direct_deploy/fmilibrary;$HOME/deps/direct_deploy/open-simulation-interface;$HOME/deps/direct_deploy/protobuf;$HOME/deps/direct_deploy/protobuf-shared;$HOME/deps/direct_deploy/units;$HOME/deps/direct_deploy/mantleapi;$HOME/deps/direct_deploy/yase;$HOME/deps/direct_deploy/openscenario_api;$HOME/deps/direct_deploy/openscenario_engine;$HOME/deps/direct_deploy/gtest;$HOME/deps/direct_deploy/boost;$HOME/deps/direct_deploy/qt;$HOME/deps/direct_deploy/minizip;$HOME/deps/direct_deploy/units;$HOME/deps/direct_deploy/libiconv;$HOME/deps" -D CMAKE_INSTALL_PREFIX=/usr/local/openPASS/bin/core -D CMAKE_BUILD_TYPE=Release -D USE_CCACHE=ON -D WITH_DEBUG_POSTFIX=OFF -D OPENPASS_ADJUST_OUTPUT=OFF -D INSTALL_EXTRA_RUNTIME_DEPS=ON ..