[1.0] Align settings in Edit Text Style dlg box not stored (w/ patch)

Context: Version 1.0 under Win XP (OS is probably not relevant, though)

Steps:

1) Open or create any score
2) Menu "Style | Edit Text Style"
3) Change the alignment setting of a text style (anyone)
4) [OK] to close the dlg box
5) Menu "Style | Edit text style" again

Result: the alignment setting(s) modified in step 3) revert to original settings

Note: this is because the function void TextProp::get(TextStyle* s) in file textproperties.cpp (line 215) does not read the states of the alignment buttons. The attached patch adds the necessary code to this function.