Fixed logic to compare with “non installed” with “minor version upped" 

In verifying #155, I have failed to install build-tool another reasons.
So, I try to fix it. (These and #155 are independent of each other.)


Issue 1: When packaging begin from a fresh clone of buildozer, it is always failed to check latest version of build-tool.
Current logic:
  v_build_tools = '0'
  ver = [1, 2, 3]
  '0' > [1, 2, 3]
  --> False, do not run install build-tool.

Fixed:
  v_build_tools = [0]
  ver = [1, 2, 3]
  [0] > [1, 2, 3]
  --> True, do not run install build-tool.

Issue 2: wrong args for _android_update_sdk()
Method expects string as arg, but passed with list.
Fix to pass package name based from version list, for example ver=[1,2,3'] --> arg='build-tool-1.2.3'.

attakei