Fix some invalid "# pragma: no cover" comments

We accidentally used "# pragma: no coverage" instead.

qutebrowser/misc/checkpyver.py

@@ -27,7 +27,7 @@ import sys
 try:
     # Python3
     from tkinter import Tk, messagebox
-except ImportError:  # pragma: no coverage
+except ImportError:  # pragma: no cover
     try:
         # Python2
         from Tkinter import Tk
@@ -50,7 +50,7 @@ def check_python_version():
         version_str = '.'.join(map(str, sys.version_info[:3]))
         text = ("At least Python 3.4 is required to run qutebrowser, but " +
                 version_str + " is installed!\n")
-        if Tk and '--no-err-windows' not in sys.argv:  # pragma: no coverage
+        if Tk and '--no-err-windows' not in sys.argv:  # pragma: no cover
             root = Tk()
             root.withdraw()
             messagebox.showerror("qutebrowser: Fatal error!", text)

qutebrowser/misc/ipc.py

@@ -170,7 +170,7 @@ class IPCServer(QObject):
         self._timer.setInterval(READ_TIMEOUT)
         self._timer.timeout.connect(self.on_timeout)
 
-        if os.name == 'nt':  # pragma: no coverage
+        if os.name == 'nt':  # pragma: no cover
             self._atime_timer = None
         else:
             self._atime_timer = usertypes.Timer(self, 'ipc-atime')