Fix directory permissions.

'install -d' does not take a set of access settings as first numerical
argument. At least on MacOS (BSD), but according to the manpage
(https://linux.die.net/man/1/install) on Linux, an extradirectory with
the name '755' were created.

bash-git-prompt.spec

@@ -27,12 +27,12 @@ install. It will disable the prompt accordingly after uninstall.
 # These comments are here to avoid rpm lint issue
 
 %install
-install -d 755 %{buildroot}%{_datadir}/%{name}
+install -dm 755 %{buildroot}%{_datadir}/%{name}
 install -pm 755 *.sh %{buildroot}%{_datadir}/%{name}
 #install -pm 755 *.py %{buildroot}%{_datadir}/%{name}
 install -pm 755 *.fish %{buildroot}%{_datadir}/%{name}
 install -pm 644 README.md %{buildroot}%{_datadir}/%{name}
-install -d 755 %{buildroot}%{_datadir}/%{name}/themes
+install -dm 755 %{buildroot}%{_datadir}/%{name}/themes
 install -pm 644 themes/*.bgptheme %{buildroot}%{_datadir}/%{name}/themes
 install -pm 644 themes/*.bgptemplate %{buildroot}%{_datadir}/%{name}/themes