Fix upgrade problem on dpkg systems

Any installed version of ThinLinc would have been accepted as the
desired version with the previous code. The updated code explicitly
checks for the wanted version.

Author: derfian

tasks/check_installed_deb.yml

@@ -1,6 +1,6 @@
 ---
 - name: Checking whether ThinLinc is installed
-  command: "/usr/bin/dpkg-query --list thinlinc-vsm"
+  shell: "/usr/bin/dpkg-query --list thinlinc-vsm | grep -q {{ thinlinc_version }}-{{ thinlinc_build }}"
   args:
     warn: False
   register: thinlinc_packages_installed