Fix: Redundant line break in a footprint's pad section

[mvnmgrx]

This PR implements the following to fix #15 :

• Fixed redundant line break in a footprints pad section with a schematic symbol assigned (aka net, pinfunction or pintype token set) as well as at least the solder_paste_margin_ratio token set
• Added test case for this that showed the wrong behavior before the fix

Tests:

✅ - 0.002s - Testing <class 'src.kiutils.libraries.LibTable'> to compare for case fp-lib-table. result: Success
✅ - 0.001s - Testing <class 'src.kiutils.libraries.LibTable'> to compare for case sym-lib-table. result: Success
✅ - 0.010s - Testing <class 'src.kiutils.schematic.Schematic'> to equality for case test.kicad_sch. result: Success
✅ - 0.023s - Testing <class 'src.kiutils.board.Board'> to equality for case test.kicad_pcb. result: Success
✅ - 0.028s - Testing <class 'src.kiutils.footprint.Footprint'> to compare for case test.kicad_mod. result: Success
✅ - 0.045s - Testing <class 'src.kiutils.symbol.SymbolLib'> to compare for case test.kicad_sym. result: Success
✅ - 0.006s - Testing <class 'src.kiutils.footprint.Footprint'> to equality for case test_fp_all.kicad_mod. result: Success
✅ - 0.001s - Testing <class 'src.kiutils.footprint.Footprint'> to compare for case test_fp_empty_attr.kicad_mod. result: Success
✅ - 0.002s - Testing <class 'src.kiutils.symbol.SymbolLib'> to compare for case test_sym_demorgan.kicad_sym. result: Success
✅ - 0.009s - Testing <class 'src.kiutils.symbol.SymbolLib'> to compare for case test_sym_demorgan_syitems.kicad_sym. result: Success
✅ - 0.002s - Testing <class 'src.kiutils.symbol.SymbolLib'> to compare for case test_sym_parameters.kicad_sym. result: Success
✅ - 0.009s - Testing <class 'src.kiutils.symbol.SymbolLib'> to compare for case test_sym_pins.kicad_sym. result: Success
✅ - 0.006s - Testing <class 'src.kiutils.symbol.SymbolLib'> to compare for case test_sym_alternate_pins.kicad_sym. result: Success
✅ - 0.033s - Testing <class 'src.kiutils.wks.WorkSheet'> to compare for case test_wks_all.kicad_wks. result: Success
✅ - 0.002s - Testing <class 'src.kiutils.dru.DesignRules'> to compare for case test_dru_all.kicad_dru. result: Success
✅ - 0.016s - Testing <class 'src.kiutils.board.Board'> to compare for case test_arcs.kicad_pcb. result: Success
✅ - 0.006s - Testing <class 'src.kiutils.footprint.Footprint'> to compare for case test_fp_pad_newlines.kicad_mod. result: Success

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✅ KiUtils tests done, all green ✅